This method returns the room-level roles that the current user can assign to the members that they invite to a room.
Note: This method works only for Rooms v6 and only returns roles that have
isExternal set to true.
(Required) The id of the room.
(Required) The globally unique identifier (GUID) for the account.
|Optional Query Parameters|
(Optional) The email address of a specific member. Using this parameter returns only the roles that the current user can assign to the member with that email address.
(Optional) A search filter that returns assignable roles by the beginning of the role name.
Note: You do not enter a wildcard (*) at the end of the name fragment.
(Optional) The index position within the total result set from which to start returning values. The default value is
(Optional) The number of results to return. This value must be a number between
Assignable roles successfully retrieved.
Bad request. See ErrorCode and Message for details
Not authorized to make this request.