Authenticate via Azure Functions managed Identity

I would like to call an azure function from other Function. To do this job I have this code:

public static class Function1
{
    [FunctionName("Function1")]
    public static void Run(
        [HttpTrigger(AuthorizationLevel.Function, "get", Route = null)] HttpRequest req,
        ILogger log)
    {
        Uri m;
        string t;

        var data = new
        {
            name = "master"

        };



        string result = string.Empty;

        var askForlicenseURL = "https://<myFunctionname>/api/HttpTrigger_StartOrchestrator";
    
        var content = new StringContent(data.ToString(), Encoding.UTF8, "application/json");

        using (HttpClient client = new HttpClient())
        {
            client.DefaultRequestHeaders.Add("x-functions-key", "Md5xxxxxxxxxxxxxxxxxxxxx0ij5A==");
            using (HttpResponseMessage response = client.PostAsync(askForlicenseURL, content).Result)
            using (HttpContent respContent = response.Content)
            {
                // ... Read the response as a string.
                var tr = respContent.ReadAsStringAsync().Result;
                // ... deserialize the response, we know it has a 'result' field
                dynamic azureResponse = JsonConvert.DeserializeObject(tr);
                // ... read the data we want
                result = azureResponse.statusQueryGetUri;
                var Header = response.Headers.Location;
            }
        }
    }

In sted of Azure Function key I would like to use system assignedmanaged Identity. (The manaagement Identity of caller is authorized as contributer in target azure function AND I know alternatively I can use Durable Function, but in this case I dont want to use it :)