diff --git a/src/IdentityAuthClient.js b/src/IdentityAuthClient.js
index 133cca774b..58a1773924 100644
--- a/src/IdentityAuthClient.js
+++ b/src/IdentityAuthClient.js
@@ -56,16 +56,10 @@ export default class IdentityAuthClient {
         return token;
     }
 
-    _checkToken(token) {
-        // TODO: Test current API token via `/account` endpoint
+    async _checkToken(token) {
+        await MatrixClientPeg.get().getIdentityAccount(token);
 
-        // At the moment, Sydent doesn't implement `/account`, so we can't use
-        // that yet. We could try a lookup for a null address perhaps...?
-        // Sydent doesn't currently expire tokens, but we should still be testing
-        // them in any case.
-        // See also https://github.com/vector-im/riot-web/issues/10452.
-
-        // In any case, we should ensure the token in `localStorage` is cleared
+        // We should ensure the token in `localStorage` is cleared
         // appropriately. We already clear storage on sign out, but we'll need
         // additional clearing when changing ISes in settings as part of future
         // privacy work.
@@ -86,7 +80,9 @@ export default class IdentityAuthClient {
                 // See https://github.com/vector-im/riot-web/issues/10443
                 console.warn("IS doesn't support v2 auth");
                 this.authEnabled = false;
+                return;
             }
+            console.error(err);
         }
     }
 }