How can I resolve the 'api_client not associated with fulfillment service' error?

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We are trying migrate our Order API, to Fulfillment Order API, and we are calling this URL, with the code below, but we are receiving error as  The api_client is not associated with any fulfillment service

Please let us know how to resolve this error, we have around 30 sites to migrate

var client = new RestClient();

client.Authenticator = new HttpBasicAuthenticator(apiKey, apiPwd);

var requestres = new RestRequest(shopifyURL, Method.GET);
requestres.AddHeader("X-Shopify-Access-Token", "xxxxxxxx");
requestres.AddHeader("header", "Content-Type: application/json");
IRestResponse response = client.Execute(requestres);



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