Unknown error (500) when calling bookingBusinesses endpoints

Good morning,

I have been trying for a few days to use Microsoft Graph services for Bookings:

• https://graph.microsoft.com/v1.0/solutions/bookingBusinesses/{id}
• https://graph.microsoft.com/v1.0/solutions/bookingBusinesses/{id}/staffMembers
• https://graph.microsoft.com/v1.0/solutions/bookingBusinesses/{id}/services
• https://graph.microsoft.com/v1.0/solutions/bookingBusinesses/{id}/customQuestions
• https://graph.microsoft.com/v1.0/solutions/bookingBusinesses/{id}/getStaffAvailability

However, a 500 error is being returned for all these requests.

The documentation (https://video2.skills-academy.com/en-us/graph/api/bookingbusiness-getstaffavailability?view=graph-rest-1.0&tabs=http) states that I need the Bookings.ReadWrite.All permission for the application permission type – which has already been granted by my organization.

The request to obtain the token is being made like this, and the token is successfully returned:

But when I pass this token to the endpoints, the 500 error mentioned earlier occurs.

A very important detail is that the {ID} (the email of the booking page) being passed to the services to retrieve information belongs to a page with "No Self-Service" visibility.

Am I doing something wrong? Or does the "No Self-Service" visibility really does not return any booking page information through Microsoft Graph services?

Any help would be appreciated.