It seems that doesn't matter if you add your clientCustomerId(MCC) in the soap headers or not .
From our side , we always get only the ClientCustomerId of the MCC account. As other people said in this thread , when you omit ClientCustomerId of your MCC on SOAP Headers, it should return a list of all customers managed by that MCC.
I attached some logs with both scenarios (with stripped sensitive info) :
- Including MCC CustomerId in SOAP Headers,
- Without Including MCC CustomerId in SOAP Headers,
Adwords API team , Could you please check in your side , and confirm if is there a bug?
If you need any other info to investigate the issue, please let me know, and i'm glad to provide it;
Thanks for your support,