1) Your service account is not authorized to create bookings of this room. 2) Your service account is not authorized to reschedule bookings of this room (g-suite connected only)

Error message:  

1) Your service account is not authorized to create bookings of this room. 2) Your service account is not authorized to reschedule bookings of this room

Solution: 

Removing permissions and then Re-Adding them to the service account, fixed the issue.