I operate a small business which offers Tiger Moth flights. I have a variety of pilots who operate on our flights and it is not financially possible to pay for accounts for all possibilities, especially as some crew will only operate one or two flights in a season. I have created a group and added them as guest users but if I try to add them to Bookings as staff either individually or as a group I get 'Your request cannot be completed right now, try again later' I have had this consistently since I started with bookings. It is frustrating as I have upgraded my 365 licence so that I could use Bookings, but now it's usefulness is limited.
