POST/external-task/LockAndFetch not fetching form field long variable

I am using a form field for the start event, which I believe can be propagated through the the entire process.

However, when I am doing POST/external-task/fetchandLock for the first service names “f1Namemod”,
I am expecting the variable ‘x’ from the response in Json when I deserialize it.
But, the variable field is not fetching any result.

Below are the lines of code:
var response = http.PostAsync(“external-task/fetchAndLock”, requestContent).Result;

var tasks = JsonConvert.DeserializeObject<IEnumerable>(response.Content.ReadAsStringAsync().Result);

Am I missing something there?

Please suggest.

Any help here?