When you create a booking calendar it does two things: Creates a user in AzureAD Ties a mailbox in Exchange Online to this mailbox Now we cannot enforce any naming conventions on these it see...
What I've done btw. is I create bookings in different subdomain - the idea came from https://blog.markdepalma.com/?p=681%20additionally, I create all the bookings in an automated way based on who is in the AD group - Using a bit Exchange Online PowerShell, and a bit MS Graph (for bookings) for this https://docs.microsoft.com/en-us/graph/api/resources/booking-api-overview?view=graph-rest-1.0. To connect to Graph API on delegated user permissions using a token I use this solution http://laurierhodes.info/?q=node/137
$ResponseJSON = $Response|ConvertFrom-JsonAs later I use
$ResponseJSON.access_tokento connect in the Connect-MgGraph.
Can write more detailed instruction if someone is interested 😄