A new Greenlight installation using OIDC fails to authenticate users.

[luckow]

1. Install Greenlight and choose Allow all users on this Cloudron
2. Log into the installed Greenlight app.
3. Recognize the error - "Du kannst nicht authentifiziert werden. Bitte kontaktiere den Administrator."

[james]

Hello @luckow
I could reproduce your issue.
When setting LOG_LEVEL=debug in /app/data/env I was able to get this error from the web logs viewer:

Feb 24 18:35:29 E, [2026-02-24T17:35:29.330015 #1] ERROR -- : [bc0248f3-ea20-4e4e-a461-e2d3862cb272] Error during authentication: Validation failed: Avatar width is not included between 1 and 300 pixels, Avatar height is not included between 1 and 300 pixels

And indeed, I have a profile picture set in Cloudron. When I removed it, I was able to log in.
An issue was created: https://github.com/bigbluebutton/greenlight/issues/6212