No Access to personal bookings error on home page

[Furgie]

Users have started seeing this error message on the Bookings homepage 

I've checked licencing, access to the app and that the app is enabled in our tenant. All appears to be well.

I can't find anything on Google linked to this error - Does anyone here have any suggestions?

Thanks, Mark.

[#2]

I have the same problem. It looks like the OWAMailboxPolicy for my users was flipped back to Default when it should be "OwaMailboxPolicy-Bookings". When we reverted the setting back to that, the user could create a bookings page.

Set-CasMailbox email address removed for privacy reasons -OwaMailboxPolicy OwaMailboxPolicy-Bookings