diff --git a/lib/components/keyserver-connection-handler.js b/lib/components/keyserver-connection-handler.js
--- a/lib/components/keyserver-connection-handler.js
+++ b/lib/components/keyserver-connection-handler.js
@@ -57,10 +57,29 @@
   const dispatchActionPromise = useDispatchActionPromise();
   const callLogOut = useLogOut();
 
+  const { olmAPI } = getConfig();
+
   const hasConnectionIssue = useSelector(
     state => !!connectionSelector(keyserverID)(state)?.connectionIssue,
   );
   const cookie = useSelector(cookieSelector(keyserverID));
+  const prevCookie = React.useRef(cookie);
+
+  React.useEffect(() => {
+    if (cookie === prevCookie.current || !cookie) {
+      return;
+    }
+
+    void (async () => {
+      await olmAPI.reassignNotificationsSession?.(
+        prevCookie.current,
+        cookie,
+        keyserverID,
+      );
+      prevCookie.current = cookie;
+    })();
+  }, [cookie, keyserverID, olmAPI]);
+
   const dataLoaded = useSelector(state => state.dataLoaded);
 
   const keyserverDeviceToken = useSelector(deviceTokenSelector(keyserverID));
@@ -101,8 +120,6 @@
   invariant(identityContext, 'Identity context should be set');
   const { identityClient, getAuthMetadata } = identityContext;
 
-  const { olmAPI } = getConfig();
-
   const preRequestUserInfo = useSelector(state => state.currentUserInfo);
   const innerPerformAuth = React.useCallback(
     (