Using Outlook for Android in business environments for email and scheduling
Just had another update in May and it has this issue again.
"While resetting the app's cache is a probable solution, we also suggest that you uninstall and reinstall the Outlook app on your Android device to start it fresh." Did work for me but is a pain to have to do this so frequently. Seems like every other month I have to do this then I have to re-add all my accounts which does take a while.