Getting permission issue for pg_signal_backend in postgre16 in azure flexible server

Hi,We recently commisioned a new flexible server using latest postgresql 16 and at the same time created an Microsoft entra administrator for our server.After that we created a database 'Test' using our Microsoft entra administrator.Then when we intended to terminate our idle connections we found that our administrator can only terminate those db sessions that are started using administrator only and another db sessions of different users are not allowed to be terminated.We also tried to run below statement "Grant pg_signal_backend to 'administrator'" but it returned the following error that 'permission denied to grant role "pg_signal_backend" Detail:Only roles with the Admin option on role "pg_signal_backend" may grant this role.We also tested the same on postgres 15 and no such issue was encountered.