Message "Application does not have the capability to make this API call." on API '/adcreative'

Question

I'm trying to create automated Facebook ads using Facebook Marketing API and Facebook Python Business SDK. So far I succeeded in posting new campaign and ad sets, but when I tried created the ad creatives it returned message "Application does not have the capability to make this API call.".

  Message: Call was not successful
  Method:  POST
  Path:    https://graph.facebook.com/v3.0/act_xxxxxx/adcreatives
  Params:  //XXX
  Status:  400
  Response:
    {
      "error": {
        "message": "(#3) Application does not have the capability to make this API call.",
        "code": 3,
        "fbtrace_id": "xxxxxx",
        "type": "OAuthException"
      }
    }

My user token permission has ads_management and ads_read and the app also has ads_reads and ads_management.

Is there anything else I'm missing?