Hi Lasse,
According to my research, Outlook store its passwords in Windows Credentials, you can search for ‘credentials’ in the search bar that comes up when you are in the Control Panel.
After closing your Outlook, go to Windows Credentials, look for and remove anything related to Outlook or Microsoft from the list, including under the Web Credentials. Then restart your Outlook client.
If the issue persists, please try creating and using a new Outlook profile via Control Panel > Mail > Show profile and see if there is any difference.
Hope this can be helpful.
Regards,
Aidan Wang
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