Google Ads Query - Caller does not have permission

Hey I am trying to use the Google Ads Query component. The only Data Source that works for me is Customer - it pulls in the Google Ads Manager Account data. But when I try and call the AdGroup and pass in a Google Customer account ID I get the following error:

 

[403] The caller does not have permission. User doesn't have permission to access customer. Note: If you're accessing a client customer, the manager's customer id must be set in the 'login-customer-id' header. See https://developers.google.com/google-ads/api/docs/concepts/call-structure#cid. 

 

Has anyone gotten around this? I have tried for 2 days and I am tempted to just do this outside of Matillion.