We are introducing several changes to the CustomerService.CreateCustomerClientGoogle Ads API  with how Google Ads UI handles new account creation functionality. These changes will take effect on March 17, 2025 .New error codes for policy enforcement 
  Google Ads manager accounts  that do not have a certain threshold of spending or a certain number of active child accounts without policy issues  (for example, not suspended or closed for policy violations) will be ineligible to create child accounts under them. Developers will receive a  CustomerError.CREATION_DENIED_INELIGIBLE_MCC error code in the upcoming version v19 of the Google Ads API. To fix the issue, link a Google Ads account that is compliant with the Google policies  and meets the threshold spending levels under your manager account.Google Ads manager accounts that have been flagged for policy violations related to account creation will no longer be able to create child accounts under them. Developers will receive a CustomerError.CREATION_DENIED_FOR_POLICY_VIOLATION error code in the upcoming version v19 of the Google Ads API. 
 
In both these cases, existing API versions (v18 and older) will throw a ContextError.OPERATION_NOT_PERMITTED_FOR_CONTEXTQuota limits for account creation QuotaError.RESOURCE_EXHAUSTEDretry_delayquota_error_detailsWhat do I need to do? support page  for options.Reach out to the Google Ads product support team  for any questions related to account policies.Anash P. Oommen , Google Ads API Team