Microsoft Bookings Admin issue

Dear Brittany,

Since removing and re-adding her did not help, the cause is most likely her account itself rather than the Bookings page. I suggest checking the following:

1. Check license: Ask your Microsoft 365 administrator to go to Microsoft 365 admin center > Users > Active users, select her account, open Licenses and apps and confirm that Microsoft Bookings is enabled and that she has an Exchange Online mailbox.
2. Re-add her: Remove her from the page again, then go to Staff > Add new staff, type her name in the search field and select her from the drop-down list. Set her role to Administrator and save. If the role switches back to Guest by itself, her account may be set up as a guest or external user in your tenant. Your administrator will need to check this, because guests cannot open the booking page.
3. Test sign-in: Have her open the Bookings page in an InPrivate browser window, signed in only with her work account.
4. Grant access directly: If she still can't get in, your administrator can give her full access to the booking page with Exchange Online PowerShell, for example:

Add-MailboxPermission -Identity <booking page email> -User <her email> -AccessRights FullAccess -InheritanceType All

It can take some time for the permission to take effect.

For reference: Add team members to Bookings

If access is still denied after these checks, I recommend that the Global Admin in your organization create a service request with Microsoft Support. A technical support engineer can perform a remote session to investigate the situation, verify the backend configurations, and run any necessary synchronization tools to resolve the problem. If the issue requires further attention, they can escalate it to a specialized team for deeper analysis. For detailed instructions on how to get support, please refer to Get support - Microsoft 365 admin. If you don't know who your IT administrator is, please refer to this article: How do I find my Microsoft 365 admin? - Microsoft Support 

I hope this helps. Looking forward to your reply.

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