Hi CaitAd,
Thank you for the posting in our forum community.
Based on your case description, we suppose that you are using Office 365 email account and trying to setup in Outlook desktop application, if so, in this given situation, at once we suggest you to try to setup your Office 365 email account by using
SaRA tool, it can help you to setup your email account.
kindly download this SaRA tool, sign in with your Office 365 work or school account and select Outlook related topic, such as "I can't setup my Office 365 email in Outlook".
The Support and Recovery Assistant tool will run a series of diagnostic tests on your computer. If any of the tests fails, it will provide suggested solutions to get your problem solved.
If the issue persist, further to narrow down the issue, we would like to collect you below information from your side for further analysis and assistant.
1. Could you please provide us detailed steps or screenshot about "how did you try to setup email account into Outlook desktop application?
2. Kindly provide us detailed error screenshot about "Something went wrong and Outlook couldn't set up your account".
3. Can we confirm that "whether you can login to other Office desktop applications, such as Word, PowerPoint, Excel?
4. Meanwhile, can we confirm that whether you have logged in into Office with your Office 365 email account into 5 devices before?
5. Does this issue has happened with other users in the organization?
Kindly provide us above information as per your convenient time so we can further assist you accordingly.
Regards,
Darpan