diff --git a/keyserver/src/services/blob.js b/keyserver/src/services/blob.js
--- a/keyserver/src/services/blob.js
+++ b/keyserver/src/services/blob.js
@@ -107,8 +107,11 @@
   const headers = await createRequestHeaders();
   const blobResult = await downloadBlob(hash, headers);
 
-  if (blobResult.result !== 'success') {
+  if (blobResult.result === 'error') {
     return { found: false, status: blobResult.status };
+  } else if (blobResult.result === 'invalid_csat') {
+    await clearIdentityInfo();
+    return { found: false, status: 401 };
   }
   const blob = await blobResult.response.blob();
   return { found: true, blob };
diff --git a/lib/actions/upload-actions.js b/lib/actions/upload-actions.js
--- a/lib/actions/upload-actions.js
+++ b/lib/actions/upload-actions.js
@@ -33,7 +33,6 @@
 import { getMessageForException } from '../utils/errors.js';
 import { useDispatch } from '../utils/redux-utils.js';
 import { createDefaultHTTPRequestHeaders } from '../utils/services-utils.js';
-import { responseIsInvalidCSAT } from '../utils/services-utils';
 
 export type MultimediaUploadCallbacks = Partial<{
   +onProgress: (percent: number) => void,
diff --git a/lib/components/base-auto-join-community-handler.react.js b/lib/components/base-auto-join-community-handler.react.js
--- a/lib/components/base-auto-join-community-handler.react.js
+++ b/lib/components/base-auto-join-community-handler.react.js
@@ -4,6 +4,7 @@
 import _pickBy from 'lodash/fp/pickBy.js';
 import * as React from 'react';
 
+import { useInvalidCSATLogOut } from '../actions/user-actions.js';
 import { NeynarClientContext } from '../components/neynar-client-provider.react.js';
 import { useIsLoggedInToIdentityAndAuthoritativeKeyserver } from '../hooks/account-hooks.js';
 import { extractKeyserverIDFromID } from '../keyserver-conn/keyserver-call-utils.js';
@@ -80,6 +81,8 @@
   const prevCanQueryRef = React.useRef<?boolean>();
   const canQuery = loggedIn && !!fid;
 
+  const invalidTokenLogOut = useInvalidCSATLogOut();
+
   React.useEffect(() => {
     if (canQuery === prevCanQueryRef.current) {
       return;
@@ -123,6 +126,9 @@
           const blobHash = farcasterChannelTagBlobHash(channelID);
           const blobResult = await downloadBlob(blobHash, headers);
           if (blobResult.result !== 'success') {
+            if (blobResult.result === 'invalid_csat') {
+              void invalidTokenLogOut();
+            }
             return null;
           }
 
@@ -176,6 +182,7 @@
     getAuthMetadata,
     keyserverInfos,
     canQuery,
+    invalidTokenLogOut,
   ]);
 
   const potentiallyIncrementBatch: (
diff --git a/lib/utils/blob-service.js b/lib/utils/blob-service.js
--- a/lib/utils/blob-service.js
+++ b/lib/utils/blob-service.js
@@ -87,6 +87,7 @@
 
 export type BlobDownloadResult =
   | { +result: 'success', response: Response }
+  | { +result: 'invalid_csat' }
   | { +result: 'error', +status: number, +statusText: string };
 
 async function downloadBlob(
@@ -100,7 +101,9 @@
     headers,
   });
 
-  if (response.status !== 200) {
+  if (responseIsInvalidCSAT(response)) {
+    return { result: 'invalid_csat' };
+  } else if (response.status !== 200) {
     const { status, statusText } = response;
     return { result: 'error', status, statusText };
   }