Hi Qi,
Thank you for reaching out. Could you confirm that with the same OAuth2 credentials you are able to make other API calls such as create a campaign or ad?
Thanks and regards,
Xiaoming, Google Ads API Team
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Hi Qi and Ichiro,
Thank you for reaching out. There are a few possibilities. One is that your developer token is only allowed to retrieve data rather than mutate. Please check if the develop token you use has the permissible use of get and mutate functionalities. One other possibility is that the OAuth2 credentials stopped working. Give it a try to regenerate the OAuth2 credentials by following the instructions in this guide. Please also make sure the conversion tracking is correctly set up and enable auto-tagging by updating the auto_tagging_enabled attribute of Customer.
Thanks and regards,
Xiaoming, Google Ads API Team