diff --git a/src/ageAssurance/components/RedirectOverlay.tsx b/src/ageAssurance/components/RedirectOverlay.tsx
index 1885990f95..e3b93ffeb4 100644
--- a/src/ageAssurance/components/RedirectOverlay.tsx
+++ b/src/ageAssurance/components/RedirectOverlay.tsx
@@ -178,18 +178,28 @@ function Inner() {
   const {_} = useLingui()
   const {hasSession} = useSession()
   const appviewClient = useAppviewClient()
-  const polling = useRef(false)
-  const unmounted = useRef(false)
+  /*
+   * The poll effect is mount-only so a session-bundle rebuild (web cross-tab
+   * token sync, which swaps the appview client identity) does not restart the
+   * flow or permanently latch it. Read the volatile values through refs kept
+   * fresh each render so the next retry attempt picks up the current client.
+   */
+  const clientRef = useRef(appviewClient)
+  clientRef.current = appviewClient
+  const hasSessionRef = useRef(hasSession)
+  hasSessionRef.current = hasSession
+  const openMetricFired = useRef(false)
   const [error, setError] = useState(false)
   const [success, setSuccess] = useState(false)
   const {close} = useRedirectOverlayContext()
 
   useEffect(() => {
-    if (polling.current) return
+    let cancelled = false
 
-    polling.current = true
-
-    ax.metric('ageAssurance:redirectDialogOpen', {})
+    if (!openMetricFired.current) {
+      openMetricFired.current = true
+      ax.metric('ageAssurance:redirectDialogOpen', {})
+    }
 
     wait(
       3e3,
@@ -197,10 +207,12 @@ function Inner() {
         5,
         () => true,
         async () => {
-          if (!hasSession) return
-          if (unmounted.current) return
+          if (!hasSessionRef.current) return
+          if (cancelled) return
 
-          const data = await refetchAgeAssuranceServerState({appviewClient})
+          const data = await refetchAgeAssuranceServerState({
+            appviewClient: clientRef.current,
+          })
 
           if (data?.state.status !== 'assured') {
             throw new Error(
@@ -215,23 +227,24 @@ function Inner() {
     )
       .then(async data => {
         if (!data) return
-        if (!hasSession) return
-        if (unmounted.current) return
+        if (!hasSessionRef.current) return
+        if (cancelled) return
 
         setSuccess(true)
 
         ax.metric('ageAssurance:redirectDialogSuccess', {})
       })
       .catch(() => {
-        if (unmounted.current) return
+        if (cancelled) return
         setError(true)
         ax.metric('ageAssurance:redirectDialogFail', {})
       })
 
     return () => {
-      unmounted.current = true
+      cancelled = true
     }
-  }, [ax, hasSession, appviewClient])
+    // eslint-disable-next-line react-hooks/exhaustive-deps
+  }, [])
 
   if (success) {
     return (
diff --git a/src/components/ageAssurance/AgeAssuranceRedirectDialog.tsx b/src/components/ageAssurance/AgeAssuranceRedirectDialog.tsx
index 8a29238780..653b00cdc9 100644
--- a/src/components/ageAssurance/AgeAssuranceRedirectDialog.tsx
+++ b/src/components/ageAssurance/AgeAssuranceRedirectDialog.tsx
@@ -86,18 +86,28 @@ export function Inner({}: {optimisticState?: AgeAssuranceRedirectDialogState}) {
   const {_} = useLingui()
   const {hasSession} = useSession()
   const appviewClient = useAppviewClient()
-  const polling = useRef(false)
-  const unmounted = useRef(false)
   const control = useAgeAssuranceRedirectDialogControl()
+  /*
+   * The poll effect is mount-only so a session-bundle rebuild (web cross-tab
+   * token sync, which swaps the appview client identity) does not restart the
+   * flow or permanently latch it. Read the volatile values through refs kept
+   * fresh each render so the next retry attempt picks up the current client.
+   */
+  const clientRef = useRef(appviewClient)
+  clientRef.current = appviewClient
+  const hasSessionRef = useRef(hasSession)
+  hasSessionRef.current = hasSession
+  const openMetricFired = useRef(false)
   const [error, setError] = useState(false)
   const [success, setSuccess] = useState(false)
 
   useEffect(() => {
-    if (polling.current) return
+    let cancelled = false
 
-    polling.current = true
-
-    ax.metric('ageAssurance:redirectDialogOpen', {})
+    if (!openMetricFired.current) {
+      openMetricFired.current = true
+      ax.metric('ageAssurance:redirectDialogOpen', {})
+    }
 
     wait(
       3e3,
@@ -105,10 +115,12 @@ export function Inner({}: {optimisticState?: AgeAssuranceRedirectDialogState}) {
         5,
         () => true,
         async () => {
-          if (!hasSession) return
-          if (unmounted.current) return
+          if (!hasSessionRef.current) return
+          if (cancelled) return
 
-          const data = await refetchAgeAssuranceServerState({appviewClient})
+          const data = await refetchAgeAssuranceServerState({
+            appviewClient: clientRef.current,
+          })
 
           if (data?.state.status !== 'assured') {
             throw new Error(
@@ -123,23 +135,24 @@ export function Inner({}: {optimisticState?: AgeAssuranceRedirectDialogState}) {
     )
       .then(async data => {
         if (!data) return
-        if (!hasSession) return
-        if (unmounted.current) return
+        if (!hasSessionRef.current) return
+        if (cancelled) return
 
         setSuccess(true)
 
         ax.metric('ageAssurance:redirectDialogSuccess', {})
       })
       .catch(() => {
-        if (unmounted.current) return
+        if (cancelled) return
         setError(true)
         ax.metric('ageAssurance:redirectDialogFail', {})
       })
 
     return () => {
-      unmounted.current = true
+      cancelled = true
     }
-  }, [ax, hasSession, appviewClient, control])
+    // eslint-disable-next-line react-hooks/exhaustive-deps
+  }, [])
 
   if (success) {
     return (
diff --git a/src/lib/api/feed/author.ts b/src/lib/api/feed/author.ts
index 456c0d6a56..36a9d20dd2 100644
--- a/src/lib/api/feed/author.ts
+++ b/src/lib/api/feed/author.ts
@@ -19,6 +19,10 @@ export class AuthorFeedAPI implements FeedAPI {
     this._params = feedParams
   }
 
+  setClient(client: Client) {
+    this.client = client
+  }
+
   get params() {
     const params = {...this._params}
     params.includePins = params.filter === 'posts_and_author_threads'
diff --git a/src/lib/api/feed/custom.ts b/src/lib/api/feed/custom.ts
index 038c76140c..2cc94df8d8 100644
--- a/src/lib/api/feed/custom.ts
+++ b/src/lib/api/feed/custom.ts
@@ -37,6 +37,10 @@ export class CustomFeedAPI implements FeedAPI {
     this.userInterests = userInterests
   }
 
+  setClient(client: Client) {
+    this.client = client
+  }
+
   async peekLatest(): Promise<app.bsky.feed.defs.FeedViewPost> {
     const contentLangs = getContentLanguages().join(',')
     const res = await this.client.call(
diff --git a/src/lib/api/feed/demo.ts b/src/lib/api/feed/demo.ts
index d4a480aea1..4c8937cf00 100644
--- a/src/lib/api/feed/demo.ts
+++ b/src/lib/api/feed/demo.ts
@@ -11,6 +11,10 @@ export class DemoFeedAPI implements FeedAPI {
     this.client = client
   }
 
+  setClient(client: Client) {
+    this.client = client
+  }
+
   // eslint-disable-next-line @typescript-eslint/require-await
   async peekLatest(): Promise<app.bsky.feed.defs.FeedViewPost> {
     return DEMO_FEED.feed[0]
diff --git a/src/lib/api/feed/following.ts b/src/lib/api/feed/following.ts
index 56c96b777b..ea03f8ce17 100644
--- a/src/lib/api/feed/following.ts
+++ b/src/lib/api/feed/following.ts
@@ -10,6 +10,10 @@ export class FollowingFeedAPI implements FeedAPI {
     this.client = client
   }
 
+  setClient(client: Client) {
+    this.client = client
+  }
+
   async peekLatest(): Promise<app.bsky.feed.defs.FeedViewPost> {
     const res = await this.client.call(app.bsky.feed.getTimeline, {
       limit: 1,
diff --git a/src/lib/api/feed/home.ts b/src/lib/api/feed/home.ts
index ffac360ca9..fd122889ff 100644
--- a/src/lib/api/feed/home.ts
+++ b/src/lib/api/feed/home.ts
@@ -56,6 +56,12 @@ export class HomeFeedAPI implements FeedAPI {
     this.userInterests = userInterests
   }
 
+  setClient(client: Client) {
+    this.client = client
+    this.following.setClient(client)
+    this.discover.setClient(client)
+  }
+
   reset() {
     this.following = new FollowingFeedAPI({client: this.client})
     this.discover = new CustomFeedAPI({
diff --git a/src/lib/api/feed/likes.ts b/src/lib/api/feed/likes.ts
index 3531a58f44..7a0702bd52 100644
--- a/src/lib/api/feed/likes.ts
+++ b/src/lib/api/feed/likes.ts
@@ -18,6 +18,10 @@ export class LikesFeedAPI implements FeedAPI {
     this.params = feedParams
   }
 
+  setClient(client: Client) {
+    this.client = client
+  }
+
   async peekLatest(): Promise<app.bsky.feed.defs.FeedViewPost> {
     const res = await this.client.call(app.bsky.feed.getActorLikes, {
       ...this.params,
diff --git a/src/lib/api/feed/list.ts b/src/lib/api/feed/list.ts
index 5278e7dae4..35d35ec1e7 100644
--- a/src/lib/api/feed/list.ts
+++ b/src/lib/api/feed/list.ts
@@ -18,6 +18,10 @@ export class ListFeedAPI implements FeedAPI {
     this.params = feedParams
   }
 
+  setClient(client: Client) {
+    this.client = client
+  }
+
   async peekLatest(): Promise<app.bsky.feed.defs.FeedViewPost> {
     const res = await this.client.call(app.bsky.feed.getListFeed, {
       ...this.params,
diff --git a/src/lib/api/feed/merge.ts b/src/lib/api/feed/merge.ts
index 789c060afc..0c1d2782b4 100644
--- a/src/lib/api/feed/merge.ts
+++ b/src/lib/api/feed/merge.ts
@@ -64,6 +64,14 @@ export class MergeFeedAPI implements FeedAPI {
     })
   }
 
+  setClient(client: Client) {
+    this.client = client
+    this.following.setClient(client)
+    for (const feed of this.customFeeds) {
+      feed.setClient(client)
+    }
+  }
+
   reset() {
     this.following = new MergeFeedSource_Following({
       client: this.client,
@@ -203,6 +211,10 @@ class MergeFeedSource {
     this.feedTuners = feedTuners
   }
 
+  setClient(client: Client) {
+    this.client = client
+  }
+
   get numReady() {
     return this.queue.length
   }
diff --git a/src/lib/api/feed/posts.ts b/src/lib/api/feed/posts.ts
index 6093ff6698..0c35e98245 100644
--- a/src/lib/api/feed/posts.ts
+++ b/src/lib/api/feed/posts.ts
@@ -27,6 +27,10 @@ export class PostListFeedAPI implements FeedAPI {
     }
   }
 
+  setClient(client: Client) {
+    this.client = client
+  }
+
   async peekLatest(): Promise<app.bsky.feed.defs.FeedViewPost> {
     if (this.peek) return this.peek
     throw new Error('Has not fetched yet')
diff --git a/src/lib/api/feed/types.ts b/src/lib/api/feed/types.ts
index 59803a992a..9725566113 100644
--- a/src/lib/api/feed/types.ts
+++ b/src/lib/api/feed/types.ts
@@ -1,3 +1,5 @@
+import {type Client} from '@atproto/lex-client'
+
 import {type app} from '#/lexicons'
 
 export interface FeedAPIResponse {
@@ -6,6 +8,13 @@ export interface FeedAPIResponse {
 }
 
 export interface FeedAPI {
+  /**
+   * Swap in a fresh client. Feed pages retain their FeedAPI across paginations,
+   * so the client captured at construction goes stale after a session-bundle
+   * rebuild (web cross-tab token sync). Callers re-point the api at the current
+   * client before each fetch/peek so a disposed client is never used.
+   */
+  setClient(client: Client): void
   peekLatest(): Promise<app.bsky.feed.defs.FeedViewPost>
   fetch({
     cursor,
diff --git a/src/state/messages/convo/agent.ts b/src/state/messages/convo/agent.ts
index 5427d72a3e..c8fc3b8457 100644
--- a/src/state/messages/convo/agent.ts
+++ b/src/state/messages/convo/agent.ts
@@ -21,7 +21,6 @@ import {
   ACTIVE_POLL_INTERVAL,
   BACKGROUND_POLL_INTERVAL,
   INACTIVE_TIMEOUT,
-  NETWORK_FAILURE_STATUSES,
 } from '#/state/messages/convo/const'
 import {
   type ConvoDispatch,
@@ -176,6 +175,7 @@ export class Convo {
       this.setupPlaceholderData(params.placeholderData)
     }
 
+    this.updateClient = this.updateClient.bind(this)
     this.setConvo = this.setConvo.bind(this)
     this.subscribe = this.subscribe.bind(this)
     this.getSnapshot = this.getSnapshot.bind(this)
@@ -194,6 +194,18 @@ export class Convo {
     this.updateLockStatus = this.updateLockStatus.bind(this)
   }
 
+  /**
+   * Swap in a fresh chat client. On web, a cross-tab token sync rebuilds the
+   * session bundle (new client identities, same DID) and disposes the old one,
+   * whose fetch then throws. Every request reads `this.chatClient` per call, so
+   * reassigning the field keeps the convo alive without a reset (which would
+   * drop optimistic `pendingMessages`). Same-DID rebuild keeps `senderUserDid`
+   * valid, so it is intentionally left untouched.
+   */
+  updateClient(client: Client) {
+    this.chatClient = client
+  }
+
   private commit() {
     this.snapshot = undefined
     this.subscribers.forEach(subscriber => subscriber())
@@ -1198,14 +1210,13 @@ export class Convo {
     const status = getErrorStatus(e)
     if (isXrpcError(e)) {
       /*
-       * A status-less xrpc error is a network/transport failure (lex throws
-       * `XrpcInternalError`, which carries no HTTP status). The old bridge
-       * represented the same case with a sentinel `status` of `1`, which is a
-       * member of `NETWORK_FAILURE_STATUSES` - so a network failure was
-       * `recoverable`. Preserve that by treating `undefined` status the same
-       * as a network-failure status here.
+       * Defer to lex's own retry classification: transient statuses
+       * (408/425/429/5xx) and transport/fetch failures are recoverable, while
+       * permanent statuses and internal errors are not. This is the lex-native
+       * analogue of the old `NETWORK_FAILURE_STATUSES` check, and correctly
+       * excludes status-less internal/validation errors that are not retryable.
        */
-      if (status === undefined || NETWORK_FAILURE_STATUSES.includes(status)) {
+      if (e.shouldRetry()) {
         this.pendingMessageFailure = 'recoverable'
       } else {
         this.pendingMessageFailure = 'unrecoverable'
diff --git a/src/state/messages/convo/const.ts b/src/state/messages/convo/const.ts
index ee08684013..3a691dc6e7 100644
--- a/src/state/messages/convo/const.ts
+++ b/src/state/messages/convo/const.ts
@@ -2,7 +2,3 @@ export const ACTIVE_POLL_INTERVAL = 4e3
 export const MESSAGE_SCREEN_POLL_INTERVAL = 30e3
 export const BACKGROUND_POLL_INTERVAL = 60e3
 export const INACTIVE_TIMEOUT = 60e3 * 5
-
-export const NETWORK_FAILURE_STATUSES = [
-  1, 408, 425, 429, 500, 502, 503, 504, 522, 524,
-]
diff --git a/src/state/messages/convo/index.tsx b/src/state/messages/convo/index.tsx
index 2d2ca5e108..bb91152359 100644
--- a/src/state/messages/convo/index.tsx
+++ b/src/state/messages/convo/index.tsx
@@ -101,6 +101,10 @@ export function ConvoProvider({
   const service = useSyncExternalStore(convo.subscribe, convo.getSnapshot)
   const {mutate: markAsRead} = useMarkAsReadMutation()
 
+  useEffect(() => {
+    convo.updateClient(chatClient)
+  }, [convo, chatClient])
+
   const appState = useAppState()
   const isActive = appState === 'active'
   useFocusEffect(
diff --git a/src/state/messages/events/agent.ts b/src/state/messages/events/agent.ts
index 82282e10ef..b061d7b390 100644
--- a/src/state/messages/events/agent.ts
+++ b/src/state/messages/events/agent.ts
@@ -42,6 +42,17 @@ export class MessagesEventBus {
     this.init()
   }
 
+  /**
+   * Swap in a fresh chat client. On web, a cross-tab token sync rebuilds the
+   * session bundle (new client identities, same DID) and disposes the old one,
+   * whose fetch then throws. Every request reads `this.chatClient` per call, so
+   * reassigning the field is enough to keep polling alive without tearing down
+   * the bus and its in-memory poll cursor.
+   */
+  updateClient(client: Client) {
+    this.chatClient = client
+  }
+
   requestPollInterval(interval: number) {
     const id = nanoid()
     this.requestedPollIntervals.set(id, interval)
diff --git a/src/state/messages/events/index.tsx b/src/state/messages/events/index.tsx
index 2e58f48494..172cdc7f69 100644
--- a/src/state/messages/events/index.tsx
+++ b/src/state/messages/events/index.tsx
@@ -50,6 +50,10 @@ export function MessagesEventBusProviderInner({
       }),
   )
 
+  useEffect(() => {
+    bus.updateClient(chatClient)
+  }, [bus, chatClient])
+
   useEffect(() => {
     bus.resume()
 
diff --git a/src/state/queries/post-feed.ts b/src/state/queries/post-feed.ts
index d687ed7767..a198aa8669 100644
--- a/src/state/queries/post-feed.ts
+++ b/src/state/queries/post-feed.ts
@@ -201,6 +201,15 @@ export function usePostFeedQuery(
             cursor: undefined,
           }
 
+      /*
+       * A page-held api captured its client at construction. On web, a
+       * cross-tab token sync rebuilds the session bundle and disposes the old
+       * client (whose fetch then throws), so re-point the api at the current
+       * client before fetching. Safe because the swap is same-DID (fresh
+       * tokens only), so the stateful Merge/Home api's pagination is unaffected.
+       */
+      api.setClient(client)
+
       const res = await api.fetch({cursor, limit: fetchLimit})
 
       /*
@@ -422,7 +431,7 @@ export function usePostFeedQuery(
   return query
 }
 
-export async function pollLatest(page: FeedPage | undefined) {
+export async function pollLatest(page: FeedPage | undefined, client: Client) {
   if (!page) {
     return false
   }
@@ -431,6 +440,9 @@ export async function pollLatest(page: FeedPage | undefined) {
   }
 
   logger.debug('usePostFeedQuery: pollLatest')
+  // The page-held api may carry a disposed client after a session-bundle
+  // rebuild - re-point it at the current client before peeking.
+  page.api.setClient(client)
   const post = await page.api.peekLatest()
   if (post) {
     const slices = page.tuner.tune([post], {
diff --git a/src/state/queries/preferences/index.ts b/src/state/queries/preferences/index.ts
index 203ae3635c..b92120dcd6 100644
--- a/src/state/queries/preferences/index.ts
+++ b/src/state/queries/preferences/index.ts
@@ -38,8 +38,9 @@ import {
   type UsePreferencesQueryResponse,
 } from '#/state/queries/preferences/types'
 import {createQueryKey} from '#/state/queries/util'
-import {usePdsClient} from '#/state/session'
+import {useAppviewClient, usePdsClient} from '#/state/session'
 import {saveLabelers} from '#/state/session/agent-config'
+import {applyLabelersToClient} from '#/state/session/moderation'
 import {useAgeAssurance} from '#/ageAssurance'
 import {makeAgeRestrictedModerationPrefs} from '#/ageAssurance/util'
 import {useAnalytics} from '#/analytics'
@@ -57,6 +58,7 @@ export const preferencesQueryKey = createQueryKey(
 
 export function usePreferencesQuery() {
   const client = usePdsClient()
+  const appviewClient = useAppviewClient()
   const aa = useAgeAssurance()
 
   const query = useQuery({
@@ -71,11 +73,19 @@ export function usePreferencesQuery() {
       } else {
         const res = await client.call(getPreferences)
 
+        const labelerDids = res.moderationPrefs.labelers.map(l => l.did)
+
         // save to local storage to ensure there are labels on initial requests
-        void saveLabelers(
-          client.did,
-          res.moderationPrefs.labelers.map(l => l.did),
-        )
+        void saveLabelers(client.did, labelerDids)
+
+        /*
+         * Sync the subscribed labelers to the live appview client, mirroring the
+         * old `BskyAgent.getPreferences` side effect (which called
+         * `configureLabelersHeader`). Without this, subscribing/unsubscribing to
+         * a labeler would not affect server-attached labels until the session
+         * bundle is rebuilt.
+         */
+        applyLabelersToClient(appviewClient, labelerDids)
 
         const preferences: UsePreferencesQueryResponse = {
           ...res,
diff --git a/src/state/session/moderation.ts b/src/state/session/moderation.ts
index 57e092c99b..b0b085576e 100644
--- a/src/state/session/moderation.ts
+++ b/src/state/session/moderation.ts
@@ -24,6 +24,27 @@ function configureGlobalAppLabelers(dids: string[]) {
   Client.configure({appLabelers: dids as `did:${string}:${string}`[]})
 }
 
+/**
+ * Apply an account's subscribed labeler DIDs to a live appview client. The lex
+ * `Client` rebuilds the `atproto-accept-labelers` header per request, so this
+ * takes effect on the very next request without a client rebuild.
+ *
+ * The Bluesky moderation labeler is always re-asserted as the base: sending ANY
+ * `atproto-accept-labelers` header replaces the server-side default, and
+ * `setLabelers` clears then re-adds, so the moderation DID must be included
+ * explicitly to stay active.
+ */
+export function applyLabelersToClient(
+  client: Client,
+  subscribedDids: string[],
+) {
+  const perAccount = subscribedDids.filter(did => did !== api.moderation.did)
+  client.setLabelers([
+    api.moderation.did,
+    ...perAccount,
+  ] as `did:${string}:${string}`[])
+}
+
 export function configureModerationForGuest() {
   // This global mutation is *only* OK because this code is only relevant for testing.
   // Don't add any other global behavior here!
@@ -51,18 +72,8 @@ export async function configureModerationForAccount(
   // The code below is actually relevant to production (and isn't global).
   const labelerDids = await readLabelers(account.did).catch(_ => {})
   if (labelerDids) {
-    const perAccount = labelerDids.filter(did => did !== api.moderation.did)
-    /*
-     * Apply the per-account labelers to the appview client. It re-asserts the
-     * Bluesky moderation labeler as its base because sending ANY
-     * `atproto-accept-labelers` header replaces the server-side default -
-     * `setLabelers` clears then re-adds, so the moderation DID must be included
-     * explicitly to stay active.
-     */
-    bundle.appviewClient.setLabelers([
-      api.moderation.did,
-      ...perAccount,
-    ] as `did:${string}:${string}`[])
+    // Apply the per-account labelers to the appview client.
+    applyLabelersToClient(bundle.appviewClient, labelerDids)
   } else {
     // If there are no headers in the storage, we'll not send them on the initial requests.
     // If we wanted to fix this, we could block on the preferences query here.
diff --git a/src/view/com/posts/PostFeed.tsx b/src/view/com/posts/PostFeed.tsx
index dbda8d0c41..9fe1bf6b29 100644
--- a/src/view/com/posts/PostFeed.tsx
+++ b/src/view/com/posts/PostFeed.tsx
@@ -44,7 +44,7 @@ import {
   usePostFeedQuery,
 } from '#/state/queries/post-feed'
 import {truncateAndInvalidate} from '#/state/queries/util'
-import {useSession} from '#/state/session'
+import {useAppviewClient, useSession} from '#/state/session'
 import {useProgressGuide} from '#/state/shell/progress-guide'
 import {useSelectedFeed} from '#/state/shell/selected-feed'
 import {List, type ListRef} from '#/view/com/util/List'
@@ -260,6 +260,7 @@ let PostFeed = ({
   const t = useTheme()
   const {t: l} = useLingui()
   const queryClient = useQueryClient()
+  const client = useAppviewClient()
   const {currentAccount, hasSession} = useSession()
   const initialNumToRender = useInitialNumToRender()
   const feedFeedback = useFeedFeedbackContext()
@@ -333,7 +334,7 @@ let PostFeed = ({
     }
 
     try {
-      if (await pollLatest(data.pages[0])) {
+      if (await pollLatest(data.pages[0], client)) {
         if (isEmpty) {
           void refetch()
         } else {