Hi,
Thank you for reaching out to the Google Ads API support team.
According to this
blog post ,
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, I would suggest you to link a Google Ads account that is compliant with the
Google policies and meets the threshold spending levels under your manager account.
