Nextcloud Desktop Flatpak autostart always asks for new password/logon

I am using Nexctloud Desktop installed via Flatpak on Fedora/KDE, currently in Version

Nextcloud Desktop-Client Version 4.0.6daily (KDE)

When put to KDE autostart on Logon, it will start, but it will always ask for new user logon and start the browser to obtain a new token.

After closing the App and restarting it via KDEs autostart- settings for testing, it will open and have the tokens loaded the right way. No browser will open and the user will be logged in, syncing all files as defined.

Why is it always asking for the new Login/Token at Autostart? Is there any way to fix this, any working Version?