Note: To use Smart Display campaigns, your account needs to meet the conversion-based eligibility requirements: at least 50 conversions on the Display Network—or at least 100 conversions on the Search Network—in the last 30 days.
Hi Matheus,
The eligibility requirements of your Google Ads account should apply in both the Google Ads UI and the AdWords API. Also, could you confirm if my understanding is correct that you are indeed using the AdWords API? If I am correct and so I can further investigate, could you provide the complete SOAP request and response logs that was generated when the error occurred?
If you are using the Google Ads API, you may send to me the complete JSON logs instead. You may reply using the Reply privately to author option.
Thanks and regards,
Peter
Google Ads API Team