Getting a return from MVC?

Hi Guys, I am relatively new to unity and i have been extensively doing research and not really finding anything helpful, I’ve been trying to find a way to get a Unity Script to HTTP Post the values like a Username and Password to a Web API so that MVC can do the logic and processing of SQL commands. So the problem for me is to get the values from unity into MVC so that i can start doing validation checks. I have been experimenting with GET and POST but i must be doing something wrong as its not getting a return value from MVC just a blank. Does anyone have a method of sending values from unity to MVC and then doing verification and validation with the values received and then sending a token or something back to unity for display or something?

This is the Unity Code:

public void Start()
    {
        StartCoroutine(GetLoginResponse());
    }

    IEnumerator GetLoginResponse()
    {
        userName = Username.GetComponent<Text>().text;
        userPass = UserPass.GetComponent<Text>().text;


        WWWForm form = new WWWForm();
        form.AddField("Username", userName);
        form.AddField("UserPass", userPass);


        string url = "https://localhost:44359/api/values/";

        UnityWebRequest www = UnityWebRequest.Post(url, form);
    
        yield return www.SendWebRequest();

        if (www.isNetworkError)
        {
            Debug.Log(www.error);
        }
        else
        {
            if (www.isDone)
            {
                string jsonResult = System.Text.Encoding.UTF8.GetString(www.downloadHandler.data);
                usernameOutput.GetComponent<Text>().text = jsonResult;
            }
        }

Im not sure on the Code from MVC side if anyone could assist i would be very gratefull

No worries i figured out a way and it to do it with Web API in MVC the only problem is that you manually have to build the GET or POST string in unity and then send that to MVC and get the result back, this allows me to send any value to MVC and return any value for use in Unity and retain all the logic in MVC