Unable to Create Shared booking.

I have a user that unable to create a shared booking page. Every time he tried he got this error msg attached Capture. PNG. Booking is enabled organization-wide and I made sure that the user has booking app license enabled in the admin center. Other users can create shared bookings. We tried other web browsers but still the same error msg. Tried a different computer, and again got the same error. Turned off booking at the license level and turned it back on. Same results as before. users have a Business Premium License.

Thank you in advance for your help.