Fixed:

For at least a few weeks now, nothing has been running smoothly under Win11 (in conjunction with Firefox).
In the desktop application, activating the “Ask for Windows Hello on startup” setting has no effect. This is probably also the reason for the problems with the Firefox plugin. There, the error message “User locked or logged out. Please unlock this user in the desktop application and try again.” You then have to start the desktop application, explicitly click on “Unlock with Windows Hello”, unlock and then explicitly click on the plugin with “Unlock with biometrics” in Firefox, unlock and can now finally have the login data filled in automatically. Since the whole thing worked without any problems for at least months, it goes without saying that I didn't set anything wrong.
Unfortunately, this is not the first time that you have destroyed working configurations with updates.

(Translated with DeepL.com)

Desktop-App:
Version 2024.6.4
Shell 29.4.2
Renderer 122.0.6261.156
Node 20.9.0
Architecture x64

Firefox Plugin: 2024.7.1