Hi,
Thanks for reaching out to the Google Ads API Forum. I hope you are doing well today.
In relation to your concern, please note that based on out Google Ads API documentation: Managing User Access Invitations (https://developers.google.com/google-ads/api/docs/account-management/managing-invitations), “The email invitation needs to be manually accepted by the user who received the invitation. The invitation can also be accepted by the user using an alternate email address.”. That said, all invitations must be accepted manually.
I hope it clarifies. Have a great day.
Regards,