Using Outlook for Android in business environments for email and scheduling
After a ton of research and not finding any solutions that worked anywhere on the intranet forums, I finally figured out why I was not able to set up my work email on the Outlook app on my android 10 phone. If any of the other solutions you have tried do not work try this...
Go to Settings -> Security -> Device admin apps
If your company requires the Company Portal App or has Outlook Device Policy then you will need to enable these as Device admin apps by turning on the feature.