Hi Venkata,
Thank you for reaching out. That error usually occurs when there's an issue with your OAuth credentials. Please make sure you have generated them with an email address that has access to your account. I would recommend re-generating your OAuth credentials as explained in
this guide and seeing if that solves the issue.
If you are still receiving that error, please share the email address you used to generate the credentials as well as your yaml file
via Reply privately to author so that I can further investigate the issue.
Regards,
Mitchell
Google Ads API Team

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