diff --git a/app/lib/api-client.ts b/app/lib/api-client.ts
index 8bf6727..4a2f656 100644
--- a/app/lib/api-client.ts
+++ b/app/lib/api-client.ts
@@ -159,10 +159,16 @@ function markdownToText(markdown: string): string {
 async function getServiceToken(session: OAuthSession, pdsUrl: string): Promise<string> {
   const apiDid = import.meta.env.VITE_API_DID
   if (!apiDid) throw new Error('VITE_API_DID is not configured')
-  const res = await session.fetchHandler(
-    `${pdsUrl}/xrpc/com.atproto.server.getServiceAuth?aud=${encodeURIComponent(apiDid)}&lxm=com.atproto.server.getServiceAuth`,
-    { method: 'GET' },
-  )
+  const url = `${pdsUrl}/xrpc/com.atproto.server.getServiceAuth?aud=${encodeURIComponent(apiDid)}&lxm=com.atproto.server.getServiceAuth`
+  let res = await session.fetchHandler(url, { method: 'GET' })
+  if (res.status === 401) {
+    // A single 401 is not proof the session is dead: another tab may have
+    // rotated the tokens, or this request may have raced a refresh. Retry
+    // once (fetchHandler re-syncs the stored session) and only treat a
+    // repeat 401 as expiry, since DataProvider signs out on that error.
+    await sleep(500)
+    res = await session.fetchHandler(url, { method: 'GET' })
+  }
   if (!res.ok) {
     if (res.status === 401) throw new SessionExpiredError()
     const body = await res.text().catch(() => '')