diff --git a/packages/xo-server/src/xo-mixins/authentication.js b/packages/xo-server/src/xo-mixins/authentication.js
index 571d8e059..4e30a3c41 100644
--- a/packages/xo-server/src/xo-mixins/authentication.js
+++ b/packages/xo-server/src/xo-mixins/authentication.js
@@ -97,7 +97,6 @@ export default class {
       try {
         // A provider can return:
         // - `undefined`/`null` if the user could not be authenticated
-        // - the identifier of the authenticated user
         // - an object containing:
         //   - `userId`
         //   - optionally `expiration` to indicate when the session is no longer
@@ -111,12 +110,6 @@ export default class {
           continue
         }
 
-        if (typeof result === 'string') {
-          return {
-            user: await this._getUser(result),
-          }
-        }
-
         const { userId, username, expiration } = result
 
         return {