Using Outlook for Android in business environments for email and scheduling
Did it work up until midweek? If so, its a bug -
There is a service issue that is causing the log in issues. Microsoft has this article on the issue - https://support.microsoft.com/office/outlook-and-other-apps-are-unable-to-connect-to-outlook-com-f4202ebf-89c6-4a8a-bec3-3d60cf7deaef