When using Outlook 2019 or the Office 365 version on Windows, there may be an issue with the integration that the email address and password entry fails.
Installing a special registry key will fix this issue.
Note:
This is already installed on all computers in the university's AD.
Download the zip file.
Execute the unzipped registry file ExcludeExplicitO365Endpoint.reg by double-clicking it on the Windows computer.
Re-integrate the mailbox using the instructions .