Ubuntu client asks for password after each reboot

I have installed the desktop client on an Ubuntu 24.04.1 LTS system. I did connect the client to my account successfully but after each reboot, the client asks again to be connected to an account. The client seems to be unable to store the account connection.
What can I do to permanently connect that client to my account?

These are the only logfiles I can find from Nextcloud in /var/log/syslog:

2024-11-13T19:31:40.067673+01:00 frodo systemd[2718]: Started app-gnome-Nextcloud-4315.scope - Application launched by gnome-session-binary.
2024-11-13T19:31:40.790131+01:00 frodo Nextcloud.desktop[4315]: qt.qpa.plugin: Could not find the Qt platform plugin β€œwayland” in β€œβ€
2024-11-13T19:32:13.266747+01:00 frodo zeitgeist-fts[3411]: Unable to get info on application://Nextcloud.desktop