Google Cloud & Java Developer Needed

I created Java app that create google calendar event via api. I've got below error

POST https://www.googleapis.com/calendar/v3/calendars/primary/events?sendUpdates=all
{
"code": 403,
"errors": [
{
"domain": "calendar",
"message": "Service accounts cannot invite attendees without Domain-Wide Delegation of Authority.",
"reason": "forbiddenForServiceAccounts"
}
],
"message": "Service accounts cannot invite attendees without Domain-Wide Delegation of Authority."

I think it's a problem service account.
I want to do it till end of 11.05.2024
Project realization via shared desktop