RE: https://groups.google.com/g/adwords-api/c/ZHAAa6szcrU

Hi Madeleine, Thank you for reaching out to us. The PERMISSION_DENIED error usually occurs when there is no link between the manager account authenticated in the request and the client account specified in the headers. As you are using the Google Ads API you need to include the login-customer-

https://groups.google.com/g/adwords-api/c/ZHAAa6szcrU

Hello! I am - using OAuth2 credentials to extract a list of accessible accounts - using the MCC / manager, extract the customer accounts under its hierarch