Hello Rene,
I am Ramya. I will help you on this.
I apologize for the inconvenience caused.
Based on the screenshots you provided, it seems you have a work account, while when logging into Office, it recognized your account as a Microsoft account.
Actually, work or school account and Microsoft account are two different accounts.
For more information, you can refer to What is a Microsoft account and a work or school account and how do I get one?
https://support.microsoft.com/en-us/office/why-...
In this case, I would like to suggest you to log into Office.com with the corresponding account by using browser, and check if it can be accessed correctly.
Please select work or school account when logging in and check the result.
I hope this helps. Please let me know how it goes.
Thanks,
Ramya