This article will help you create a new room resource in Microsoft 365.
Log in to your admin account and go to Exchange admin center
Click on Recipients.
Click on Resources.
Click on Add a room resource.
Fill in a name of your resource.
Create an email address for your Resource ⚠ Remember the email cannot be changed later on.
Click on Next.
OPTIONAL Fill in resource properties.
Click on Next.
OPTIONAL Edit Booking Options.
Click on Next.
Click on Create.
You have to grant full access to your service account for your new room resource. Otherwise you won't be able to use your new resource in MeetingRoomApp.
You should include your room resource in the Room List (Room Lists Distribution Group). This allows you to sync all your resources with MeetingRoomApp at once otherwise you would need to add the room resource manually in the Spaces and Resources. It also ensures correct behavior across different Outlook or Outlook Web Access versions.