Hi,
Thank you for reaching out. Please make sure you've followed
this guide for setting up your credentials and updating your config file. You can try verifying your configuration as explained
here. The
Google Ads Doctor should help identify the root cause.
If you are still having issues, please provide the detailed request and response logs for your call
via reply privately to author so that I can further investigate the issue. You can find information on enabling logging under your
client library.
Regards,
Mitchell
Google Ads API Team

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