403 Service accounts cannot invite attendees without Domain-Wide Delegation of Authority.

[CAUN94]

I cant add add Attendee to event

{ "error": { "errors": [ { "domain": "calendar", "reason": "forbiddenForServiceAccounts", "message": "Service accounts cannot invite attendees without Domain-Wide Delegation of Authority." } ], "code": 403, "message": "Service accounts cannot invite attendees without Domain-Wide Delegation of Authority." } }