To pair JOAN with Microsoft Office 365, you have to grant JOAN the right to manage your Office 365 calendar. There are two ways to delegate calendar access to JOAN:
Delegate user access to the calendars you want Joan to manage
Grant access to the rooms you want JOAN to manage to a normal calendar user in Office 365. Start by logging into https://outlook.office365.com/ecp/ with your admin account, and go to "recipients" --> "resources". Click on the pencil icon and select the room resource you want JOAN to manage.
In the new window, select "mailbox delegation" and click the plus sign next to Full Access. Select the user you want to pair with JOAN, click "Add" and then save your new settings by clicking on “OK” button below.