Issue with new Outlook version Error "INVALIDCREDENTIALS TEMPORARILYUNAVAILABLE"

I’m currently experiencing a problem with my mailbox.org account in the new version of Outlook. When trying to add my account, I keep getting the following error message:

INVALIDCREDENTIALS TEMPORARILYUNAVAILABLE

- Verified password (works fine in the webmail interface and other clients)

- Re-added the account in Outlook

- Checked app passwords and two-factor authentication

- Verified connection settings (IMAP, SMTP, ports)

Does anyone have an idea what might be causing this or how to fix it? Are there any known compatibility issues between the new Outlook version and mailbox.org?

Thanks in advance for your help!