Here are the steps to setting up a group account with with user licenses:
1. Follow the steps in Create a Group Account
2. Go to Managing Group Licenses and follow the steps to “Assign a user license / add a user.”
Optionally, if you are a Microsoft 365 admin and you would like to restrict which users can use CalendarBridge, follow the steps in Restrict CalendarBridge Access to Certain Microsoft 365 Users