Managing meetings and events using Outlook on the web for business
Hi Nicholas,
Regarding your concern, if you disable the staff selection setting, when all three team members are available, Microsoft Bookings randomly assigns the appointment to one of them. It does not assign appointments based on list order or who received the previous appointment.
Also, random assignment does not guarantee an equal number of appointments for each person, so you may need to monitor the distribution and manually rebalance appointments if necessary.
For reference: Shared Bookings Frequently Asked Questions
Hope this helps. Should you have any other questions, please feel free to reach out again. I'm happy to help.