Q:

sendNotificationEmail doesn't work with service account (Drive API v3)

I can't send an email notification when I add permission in a file with the drive API v3, before May, it works fine but since 14/05/2020 doesn't send an email with node v10.16.3.
I do this to authenticate: 

and then when I add permission:

Response from drive service
enter image description here

A:

This issue has been reported on Google's Public Issue tracker

Basically, Service acocunts seemed temporarily not be able to send notification emails on their own behalf.
The notification emails are however sent and received as expected if you use impersonation.
This issue seemed to be fixed, but if it reappeared again, you should mention it in a comment of the issue.
In the meantime, use impersonation as a workaround.
Impersonation is in general a good practice when using service accounts.

