Need Help on adding attendees in google calendar events

Hi Mates,

I have completed google calendar integration to my app. I can create, update and delete events via custom API calls with my service account. But, when I try to add attendees, I have the following errors.

There was an issue setting up your call.

Raw response for the API
Status code 403
{
“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.”
}
}

My service account is set up for Domain-Wide Delegation. I could not figure out what causes the errors.

Please help me.

Thank you so much for your attention and participation.

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