Hello eva,
Welcome to Microsoft Community.
I understand that you are having some problems adding Ugent account in the Microsoft Teams and Mail applications. Thank you very much for providing the screenshot information, but if any error message appears directly when you log in, I hope you can provide the screenshot for us to confirm, because the error message in the event viewer is not helpful to this problem.
As far as I know, Ugent account is supposed to be a school account, but the school account is generally not a personal account. When logging in to the personal application with this account, you may see some error messages, such as the wrong type of account, the account does not exist or the login permission is not available. Therefore, I still hope that you can provide me with the error information when logging in, so that I can confirm your problem.
If anything is unclear, please do not hesitate to let me know.
Best regards,
Mitchell - | Microsoft community support expert from MSFT
