In the Configuring Free Busy Sharing between Exchange/Microsoft 365 and Exchange/Microsoft 365, there is the option to share calendar free/busy information with a specified security group. Currently, we are syncing an on-prem mail-enabled security group with 100’s of users to our cloud tenant. That group is used as the group for free/busy sharing. Now, the company wants to share the free/busy data for 3 conference rooms that are Azure Teams-enabled rooms.

I can’t add the Azure conference rooms to the on-premise group, because they aren’t synced with our on-prem environment. The Org Sharing also only lets you define one group to use for the sharing. If I create a new Azure mail-enabled security group and add the 3 conference rooms to it, will the free/busy sharing support nesting the on-premise group inside the Azure group?

Thanks!