Hi @3csys! Thanks for sharing the detailed steps and error logs - this is really helpful in diagnosing the issue. It sounds like the user access token warning might be related to lingering session data or incompatibilities arising from the migration. You may want to review the PostgreSQL Migration Guide and ensure all configurations align with the updated database. Additionally, checking the Mattermost Server Upgrade Guide may help confirm if any steps were missed. If the issue persists, try temporarily disabling the Jitsi plugin to narrow down its impact. Hope this helps!