Please see this thread for some possible solutions.
Its a long one so maybe scroll to the end :)
Mobile Issues are handled in that forum, not in this one
Why do I keep being logged out of my Outlook mail account in Apple mail
Mark C
41
Reputation points
Since updating to iOS 14.2 I keep being logged out of my Outlook email account. I see this is a recognised issue from the press. Is this being resolved anyone know?
Outlook | Windows | Classic Outlook for Windows | For business
10,109 questions
Accepted answer
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Andy David - MVP 157.8K Reputation points
2020-11-11T13:05:52.503+00:00
1 additional answer
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Mark C 41 Reputation points
2020-11-11T13:12:33.543+00:00 Many thanks for your help. It appears to be widespread but some people are reporting an improvement in reliability. Patience!