HttpClient does not return anything

I am currently writing a method that makes a GET request to a server. The code I'm using for that is

using (var httpClient = new HttpClient())
{
    httpClient.Timeout = TimeSpan.FromSeconds(5);
    
    httpClient.DefaultRequestHeaders.Add("licenseKey", licenseKey);
    httpClient.DefaultRequestHeaders.Add("customerKey", customerKey);
    string url = "http://localhost:3001/api/myTool/license/register";
    HttpResponseMessage response = await httpClient.GetAsync(url);
    if (response.IsSuccessStatusCode)
    {
        string responseBody = await response.Content.ReadAsStringAsync();
        JObject json = JObject.Parse(responseBody);
        
        return json["expiresOn"]?.ToString();
    }
    else
    {
        return null;
    }
}

using (var httpClient = new HttpClient())
{
    httpClient.Timeout = TimeSpan.FromSeconds(5);
    
    httpClient.DefaultRequestHeaders.Add("licenseKey", licenseKey);
    httpClient.DefaultRequestHeaders.Add("customerKey", customerKey);
    string url = "http://localhost:3001/api/myTool/license/register";
    HttpResponseMessage response = await httpClient.GetAsync(url);
    if (response.IsSuccessStatusCode)
    {
        string responseBody = await response.Content.ReadAsStringAsync();
        JObject json = JObject.Parse(responseBody);
        
        return json["expiresOn"]?.ToString();
    }
    else
    {
        return null;
    }
}

For the endpoint, I'm currently using Mockoon until the actual server is ready. Now my call does not return. It neither comes back with an actual response nor does it throw the TaskCanceledException which it should after timing out. I've let it run for over 2 minutes now and it never reaches the exception nor the if statement right below the call. How can that happen?
Mockoon logs the call and also seems to send something back, but this never arrives apparently.
I can use call the endpoint successfully using postman, so that can't be it...

I am currently writing a method that makes a GET request to a server. The code I'm using for that is

using (var httpClient = new HttpClient())
{
    httpClient.Timeout = TimeSpan.FromSeconds(5);
    
    httpClient.DefaultRequestHeaders.Add("licenseKey", licenseKey);
    httpClient.DefaultRequestHeaders.Add("customerKey", customerKey);
    string url = "http://localhost:3001/api/myTool/license/register";
    HttpResponseMessage response = await httpClient.GetAsync(url);
    if (response.IsSuccessStatusCode)
    {
        string responseBody = await response.Content.ReadAsStringAsync();
        JObject json = JObject.Parse(responseBody);
        
        return json["expiresOn"]?.ToString();
    }
    else
    {
        return null;
    }
}

using (var httpClient = new HttpClient())
{
    httpClient.Timeout = TimeSpan.FromSeconds(5);
    
    httpClient.DefaultRequestHeaders.Add("licenseKey", licenseKey);
    httpClient.DefaultRequestHeaders.Add("customerKey", customerKey);
    string url = "http://localhost:3001/api/myTool/license/register";
    HttpResponseMessage response = await httpClient.GetAsync(url);
    if (response.IsSuccessStatusCode)
    {
        string responseBody = await response.Content.ReadAsStringAsync();
        JObject json = JObject.Parse(responseBody);
        
        return json["expiresOn"]?.ToString();
    }
    else
    {
        return null;
    }
}

HttpClient does not return anything

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