Hello, Thanks for getting back to us and for sharing those logs.
As per checking on the CID (4230269174), this is a Production MCC account and not a test MCC account. You should create a test MCC account by following this guide. Once a test MCC account has been created, use this in the login-customer-id field (if your OAuth2 credentials were created by a user / email that has access to the said test MCC) then you can now create a test client account. As an aside, I will be removing the thread that contains the logs. Moving forward, avoid sharing logs in forum and only send those privately. Below is a copy of your post with the redacted details. No, the developer token is not approved, but the request is against a testing account, so it should be ok, shouldn't it? 1. Response/request details: 2021-08-02 12:18:02,159 [INFO] google.ads.googleads.client: Request ------- Method: /google.ads.googleads.v7.services.CustomerService/CreateCustomerClient Host: googleads.googleapis.com Headers: { "developer-token": "REDACTED", "login-customer-id": "4230269174", "x-goog-api-client": "gl-python/3.8.4 grpc/1.39.0 gax/1.31.1 gapic/13.0.0", "x-goog-request-params": "customer_id=4230269174" } Request: customer_id: "4230269174" customer_client { descriptive_name: "Test currency_code: "CZK" time_zone: "Europe/Prague" } Response ------- Headers: { "google.ads.googleads.v7.errors.googleadsfailure-bin": "\nm\n\u0002H\n\u0012gThe developer token is not approved. Non-approved developer tokens can only be used with test accounts.\u0012\u0016xxxx", "grpc-status-details-bin": "\b\u0007\u0012#The caller does not have permission\u001a\u0001\nCtype.googleapis.com/google.ads.googleads.v7.errors.GoogleAdsFailure\u0012\u0001\nm\n\u0002H\n\u0012gThe developer token is not approved. Non-approved developer tokens can only be used with test accounts.\u0012\u0016xxxx", "request-id": "REDACTED" } Fault: errors { error_code { authorization_error: DEVELOPER_TOKEN_NOT_APPROVED } message: "The developer token is not approved. Non-approved developer tokens can only be used with test accounts." } request_id: "REDACTED" 2021-08-02 12:18:02,159 [WARNING] google.ads.googleads.client: Request made: ClientCustomerId: 4230269174, Host: googleads.googleapis.com, Method: /google.ads.googleads.v7.services.CustomerService/CreateCustomerClient, RequestId: REDACTED, IsFault: True, FaultMessage: The developer token is not approved. Non-approved developer tokens can only be used with test accounts. 2. Accoun id: 423-026-9174 Regards, Mark Kevin Albios Google Ads API Team ref:_00D1U1174p._5004Q2JFIAz:ref -- -- =~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~ Also find us on our blog: https://googleadsdeveloper.blogspot.com/ =~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~ You received this message because you are subscribed to the Google Groups "AdWords API and Google Ads API Forum" group. To post to this group, send email to adwords-api@googlegroups.com To unsubscribe from this group, send email to adwords-api+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/adwords-api?hl=en --- You received this message because you are subscribed to the Google Groups "AdWords API and Google Ads API Forum" group. To unsubscribe from this group and stop receiving emails from it, send an email to adwords-api+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/adwords-api/tMl8j000000000000000000000000000000000000000000000QX8UGQ007LU0EMB2RqOoMGyGOUe6wg%40sfdc.net.