A short description of the issue:

Creating events with the advanced calendar, invitation emails are not sent to guests regardless of values for 'sendNotifications' or 'sendUpdates'.

A small code sample that reliably reproduces the issue. The sample should run as-is or with minimal setup, without external dependencies.

```
function testMail() {
var calendarId = 'someId';
var eventId = 'anotherId';
var event = Calendar.Events.get(calendarId, eventId);
event.attendees.push({
email: 'test@example.com'
});
event = Calendar.Events.patch(event, calendarId, eventId, {
sendNotifications: true,
sendUpdates: 'all'
});
}
```

What steps will reproduce the problem?
1. Create or patch a calendar event with an external email address as an attendee. Include 'sendUpdates: "all"' in the options object.
2. Check your external mail.

What is the expected output? What do you see instead? If you see error messages, please provide them.

Expected: The external mail account should receive an invite email for the new/updated event.

Instead: The event is created, attendees are registered on the event, but external email addresses do not receive invitations.

Please provide any additional information below.

It's possible this is a permission scopes problem, which needs to be either auto-detected or added to the documentation. I've tried with the following scopes applied:

"oauthScopes": ["https://www.googleapis.com/auth/calendar", "https://www.googleapis.com/auth/script.external_request", "https://www.googleapis.com/auth/script.send_mail"]

Issue 122770338

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