C# check telegram login hmac

I've tried to implement telegram login widget on my project but faced with problem. I don't know why, but hash that I received from telegram and hash that I calculated (by tutorial from telegram) doesn't equal. I wrote my own hash calculating method, and tried to use telegram login widget nuget package but both ways doesn't work :(.

My hash calculating methods:

public class TelegramHmacTest
{
    private const string BotToken = "123:ABC";
    private const string ExpectedHash = "blablabla";
    
    [Fact]
    public void HmacTest()
    {
        var info = new Dictionary<string, string>
        {
            {"auth_date", "1234567"},
            {"first_name", "abc"},
            {"id", "123456"},
            {"photo_url", "https://t.me/i/userpic/...jpg"},
            {"username", "usr"},
        };

        var dataString = CombineString(info);
        var computedHash = HashHMAC(dataString);

        Assert.Equal(ExpectedHash, computedHash.ToLower());
    }

    private string HashHMAC(string message)
    {
        using var hasher = SHA256.Create();
        var keyBytes = hasher.ComputeHash(Encoding.UTF8.GetBytes(BotToken));

        var messageBytes = Encoding.UTF8.GetBytes(message);
        var hash = new HMACSHA256(keyBytes);
        var computedHash = hash.ComputeHash(messageBytes);
        return Convert.ToHexString(computedHash);
    }

    private string CombineString(IReadOnlyDictionary<string, string> meta)
    {
        var builder = new StringBuilder();

        TryAppend("auth_date");
        TryAppend("first_name");
        TryAppend("id");
        TryAppend("last_name");
        TryAppend("photo_url");
        TryAppend("username", true);

        return builder.ToString();

        void TryAppend(string key, bool isLast = false)
        {
            if (meta.ContainsKey(key))
                builder.Append($"{key}={meta[key]}{(isLast ? "" : "\n")}");
        }
    }
}

Calculating hash using library:

[Fact]
    public void TestLib()
    {
        var BotToken = "123:ABC";
        var info = new Dictionary<string, string>
        {
            {"auth_date", "1234567"},
            {"first_name", "abc"},
            {"id", "123456"},
            {"photo_url", "https://t.me/i/userpic/...jpg"},
            {"username", "usr"},
        };

        var loginWidget = new LoginWidget(BotToken);
        if (loginWidget.CheckAuthorization(info) == Authorization.Valid)
        {
            // user valid
        }
    }

Maybe someone had a similar problem?