Hello Jennifer
My name is Dayarys, I will try to help you.
In conclusion, you have already removed the other account in Settings > Accounts > Access work or school, and you only have the account of the associated university.
In this case, go to Credential Manager and remove all information related to Microsoft Office:
https://support.microsoft.com/en-gb/windows/acc...
Let us know if you need more help.
Sincerely,
Dayarys