Hello,

Thank you for reaching out to us. Let me do the best I can to assist you in 
this.

I can see that you have received the NOT_ADS_USER error when you attempted to 
connect to the API. The NOT_ADS_USER error is encountered when the service 
account has not been correctly linked to the Google Ads account via the OAuth2 
assertion flow. Please take note that the email address you may have used to 
generate the credentials should have access or be associated with Google Ads 
accounts.


In order to connect to Google Ads API using a Google service account, you will 
need a Google Workspace domain since it is a prerequisite for using service 
accounts. Since you mentioned that you’re using service account credentials, 
could you confirm if you already followed all the mentioned requirements:

The service account that you created needs to be granted domain wide delegation 
access by a super administrator for the domain.
Using a Google Ads user with permissions on the Google Ads account you want to 
access.
Make sure that you have your own domain registered with Google Workspace.
Service account will have the ability to impersonate any user in the domain


You may refer to this API documentation that discusses how to access the Google 
Ads API with service accounts.


In addition, kindly note that, we strongly recommend using OAuth2 installed app 
or web flows instead of service accounts unless you need domain-specific 
features (for example, impersonation). OAuth2 installed application and web 
flows require user interaction only once, when access to the account is 
granted. You need to implement the code set up on your end to make calls using 
service accounts.

Regards,

Teejay Wennie
Google Ads API Team
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