Using Outlook for Android for personal email and calendar management
As far as I can tell it seems to have resolved on my end as I am not seeing the red light and notices indicating an authentication error.
Keep in mind it may take a while for the update to fully propagate to the server you connect locally.
I know a few years back at my employer, they would tell me that when they made an update in active directory, it could take up to 30 minutes for the changes to get applied to all the remote servers.
What I have done is go into the Apps under settings, force the hub, email, calendar, etc apps to stop. Then reopen the hub and wait for it to reconnect.
The other trick that works is turn off wifi and cellulardata. Wait a few seconds and turn it back on. That seems to trigger the apps to check the server for updates.