Hi Anthony, Thank you for the reply. I am also a member of the Google Ads API team and let me provide support to your concern.
Upon checking the error message, I can see that the authentication flow that the API is validating is still OAuth2 desktop app or web app flow even though you are implementing a service account. With this, you may try following this guide as it discusses the steps on how to implement the service account for Python client library. However, we strongly recommend using OAuth2 desktop app or web app flow instead of service accounts (for example, impersonation). OAuth2 desktop app and web app flows do require an initial user interaction for granting access to the account, but are much simpler to set up. For the OAuth2 desktop app flow, you can persist a refresh token (which never expires) to obtain a new access token whenever necessary. When using one of our client libraries, you can authorize your app by filling out a configuration file. However, if you still prefer a service account and the issue persists after trying the provided suggestion, then please provide the complete request and response logs with request ID and request header generated on your end. You can check the provided links to have a clearer view on the information that I am asking. This information can be extracted when logging of the API transaction is enabled. If not enabled, then you can follow one of the guides below for the specific client library that you are us: Java - https://developers.google.com/google-ads/api/docs/client-libs/java/logging .Net - https://developers.google.com/google-ads/api/docs/client-libs/dotnet/logging PHP - https://developers.google.com/google-ads/api/docs/client-libs/php/logging Python - https://developers.google.com/google-ads/api/docs/client-libs/python/logging Ruby - https://developers.google.com/google-ads/api/docs/client-libs/ruby/logging Perl - https://developers.google.com/google-ads/api/docs/client-libs/perl/logging Please provide it in the private email thread. Regards, Ernie John Google Ads API Team ref:_00D1U1174p._5004Q2Xk3z4:ref -- -- =~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~ Also find us on our blog: https://googleadsdeveloper.blogspot.com/ =~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~ You received this message because you are subscribed to the Google Groups "AdWords API and Google Ads API Forum" group. To post to this group, send email to adwords-api@googlegroups.com To unsubscribe from this group, send email to adwords-api+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/adwords-api?hl=en --- You received this message because you are subscribed to the Google Groups "Google Ads API and AdWords API Forum" group. To unsubscribe from this group and stop receiving emails from it, send an email to adwords-api+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/adwords-api/EjqzA000000000000000000000000000000000000000000000R8D4QS00j1q8kc5uRtabaRNPjUvCyA%40sfdc.net.