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Outlook | Outlook for mobile | Outlook for Android | For business
Using Outlook for Android in business environments for email and scheduling
The very unhelpful "An error occurred" message is plaguing my Outlook (on Android) app also. The fact that there is no additional error information (not even an error code that could be passed on to support) is infuriating.
The issues are on a Galaxy S9. I'd engaged Microsoft Support via the app and while they've tried to be helpful they have not been able to do anything beyond "try our latest build".
This is only in connection with Office 365 accounts, one managed by a small business and one managed by a larger enterprise.
I resolved the issue - temporarily - by going through a hard reset of my phone, but the connection with Office 365 broke again and the error is now reoccurring.
For clarity, this does not affect OneDrive. The Android Outlook app works with non-Microsoft accounts and Microsoft personal (i.e. outlook.com) accounts but not with Office 365 accounts. The email accounts that don't work with the Android Outlook app work fine with other email and calendar clients. The Outlook app works fine on iOS for the same accounts.