Unable to create offline conversion data set

Question

Having some difficulties creating offline data sets for third party clients. Any assistance would be greatly appreciated

My app has received approval for ads_management advanced access.

I've tried creating a data set for third party client. The query works when not using a third party client.

Followed guide: https://developers.facebook.com/docs/marketing-api/offline-conversions/#create-event

Reference: https://developers.facebook.com/docs/graph-api/reference/offline-conversion-data-set

mentions that create is not possible with endpoint

Also followed steps at https://developers.facebook.com/docs/marketing-api/error-reference/ on how to fix error code 100 subcode 33

Is there an email for me to directly be in contact with a representative from facebook as there doesn't seem to be any response by asking for help on their developer support community platform.

==== Query
curl -i -X POST
"https://graph.facebook.com/v13.0/1038336089886049/offline_conversion_data_sets?name=test&access_token=<access token sanitized>"
==== Access Token Info
{
"perms": [
"ads_management",
"ads_read",
"business_management",
"public_profile"
],
"user_id": 107067181490117,
"app_id": 727875011192319
}
==== Parameters
Query Parameters


{}
POST Parameters


{
"name": "test"
}
==== Response
{
"error": {
"message": "Unsupported post request. Object with ID '1038336089886049' does not exist, cannot be loaded due to missing permissions, or does not support this operation. Please read the Graph API documentation at https://developers.facebook.com/docs/graph-api",
"type": "GraphMethodException",
"code": 100,
"error_subcode": 33,
"fbtrace_id": "AGLcWO18mvGHILHCiJNiOdc"
}
}

==== Debug Information from Graph API Explorer https://developers.facebook.com/tools/explorer/?method=POST&path=1038336089886049%2Foffline_conversion_data_sets&version=v13.0&name=test