id property
ID is the room to add to. It is the path segment: the URL is the addressing authority, and the org it is resolved in comes from the caller's principal, so an id from another tenant is simply not found.
Please note: This property should have been non-nullable! Since the specification file does not include a default value (using the "default:" property), however, the generated source code must fall back to having a nullable type. Consider adding a "default:" property in the specification file to hide this note.
Implementation
String? id;