Problems to extract custom fields data in MS-Booking by using Graph tool.

Problem #1 : On the first following command/request :

https://graph.microsoft.com/beta/bookingBusinesses/pouvtech@cegeptroisrivieres.onmicrosoft.com/appointments

A lot of customer and appointments records and/or data are missing. Data like customer ID, customer name, customer email are empty !!?? No reason. See attached file. 

Problem #2 : On the second following command/request to extract custom fileds data  https://graph.microsoft.com/beta/users/pouvtech@cegeptroisrivieres.onmicrosoft.com/events/AAMkADY2MjA3OGM3LTYwOWUtNGU5NS04YzAxLTE5NTk5MzJhN2I3OQBGAAAAAABCDbBYqWVtR5zSlJwdYN2dBwB4ZfrSVkupTZ_RUHowUU-UAAAAAAENAAB4ZfrSVkupTZ_RUHowUU-UAAAOTblRAAA=?$expand=singleValueExtendedProperties($filter%3Did eq 'Binary {ccb88e73-951a-4b10-bb49-e6628b8d8494} Name BookingItemAnsweredCustomQuestions')

Same problems because customer ID and appoitnments are missing and/or empty.

Thank you for your help

JF