Hi Elizaola,
In order to assist you properly, we would like to confirm a few thing first to know your situation better:
1. Which Office 365 subscription are you using?
2. Please sign into Office 365 portal via browser, check if there is any issue at the Office 365 settings > Software page and confirm which Office products you installed.
3. Could you share some relevant screenshots of the error message? We'd like to look into the process and the error message the precisely. To upload screenshots, please click Use rich Formatting in this thread and select the Insert/Edit Media icon.
4. Do other users in your organization encounter the same issue?
5. Has Active Directory Federation Services been deployed in your organization?
After getting the information above, we'll proceed further.
Thanks,
Alice Wang