Why is HttpClient.GetStringAsync response empty when fetching lyricsify.com?

I want to use GetStringAsync to query lyricsify.com but I always get an empty string as result.

With Insomnia, Powershell and other tools, I get the HTML response as expected.

[Fact]
public async void HttpClientTest()
{
    HttpClient httpClient = new HttpClient();
    string googleResponse = await httpClient.GetStringAsync("https://www.google.com");
    Debug.WriteLine($"googleResponse: {googleResponse}");
    // works as expected
    Assert.NotEmpty(googleResponse);

    string lyricsifyResponse = await httpClient.GetStringAsync("https://www.lyricsify.com");
    Debug.WriteLine($"lyricsifyResponse: {lyricsifyResponse}");
    // fails
    Assert.NotEmpty(lyricsifyResponse);
}

• I checked the response object, it has status code 200 OK.
• I checked redirects, which are enabled.

Any ideas?
Did I miss something peculiar that lyricsify.com is doing?
Do I need to configure anything in the HttpClient to get the expected web page as response?

Some websites expected to pass User-Agent, so only pass some random values as User-Agent like this:

HttpClient httpClient = new HttpClient();

httpClient.DefaultRequestHeaders.Add("User-Agent", "some-thing");

// rest of code

A header can be added to the request.
As follows;

request.Headers.Add("HeaderName","Value");

You can also test this with Postman.