Using Outlook for Android for personal email and calendar management
Hello, exactly the same issue here. Regular interruptions in mail delivery since 2 weeks, last days it got worse. Today I tried everything I could find (servers, ports, 2-step auth, app password, changing my password...) Nothing worked. At the end I tried to delete my account from the phone. I should not have done it because now I can't recreate it at all and my calendar is gone.
I hope Microsoft will solve the issue ASAP, but for the moment they do not seem much concerned...