I am invoking a POST operation within the Graph API to create a privileged role assignment (https://graph.microsoft.com/beta/privilegedRoleAssignments). Using an account who is a Privileged Role Administrator.
Following documentation here
https://docs.microsoft.com/en-us/graph/api/privilegedroleassignment-post-privilegedroleassignments?view=graph-rest-beta&tabs=http
I am receiving a 503 Bad Request error when invoking the API

