Hi Yannis,
The
CUSTOMER_NOT_ENABLED error indicates that the customer can't be used because it isn't enabled. This means that the customer accounts may have been cancelled or inactive. If you believe that these customer accounts are active and this error should not be occurring, please provide the complete detailed logs of your request and response via the
"Reply privately to author" option. To enable logging, you can refer to
this guide.
Regards,
Danica, Google Ads API Team

ref:_00D1U1174p._5004Q22YA14:ref