Same poorly informative error message still received when trying to add a Microsoft 365 account with Sailfish OS Sauna 4.6.0.13.
Could it be that the Microsoft account additions (old ‘Microsoft Exchange’ or new ‘Microsoft 365’) only work when you have a business Microsoft account?
In that case, how should one keep on accessing a private Microsoft email account with Sailfish OS after September 16th, when basic authentication will be abandoned and only OAuth2 authentication will be allowed?