Adds a room mailbox to a specified tenant.
This function adds a room mailbox to a specified tenant by calling the CIPP API endpoint '/api/AddRoomMailbox'.
It requires the tenant ID, display name, domain, and username as mandatory parameters.
Optionally, the resource capacity can also be specified.
The ID of the customer tenant where the room mailbox will be added. Either TenantID or Default domain can be used to identify the tenant.
The display name for the room mailbox.
The domain for the room mailbox.
The username for the room mailbox.
The resource capacity for the room mailbox. This parameter is optional.
Add-CIPPRoomMailbox -CustomerTenantID "7e3effb6-6efe-42f2-b071-48ce318eaf95" `
-DisplayName "Conference Room 1" `
-Domain "example.com" `
-Username "confroom1" `
-ResourceCapacity 10