I am developing a .NET application using the SpotifyAPI (I am quite new to C#).

I am getting this error when calling spotify.Player.PausePlayback()

Weirdly I was not getting this error a few weeks ago, even with the version of the code I am sharing in this question, and I have just suddenly started getting it. Here is the version of it that was working and is now giving this weird error:

static (Uri, string) InitializeSpotify()
{
    var (verifier, challenge) = PKCEUtil.GenerateCodes();
    string ClientId="MyclientId"; 
    


    var loginRequest = new LoginRequest(new Uri("https://127.0.0.1:8000/callback/"),ClientId,LoginRequest.ResponseType.Code)
    {
    CodeChallengeMethod = "S256",
    CodeChallenge = challenge,
    Scope = new[] {Scopes.PlaylistReadPrivate, Scopes.PlaylistReadCollaborative,Scopes.Streaming}
    };

    var uri = loginRequest.ToUri();
    return (uri,verifier);

}
static string GetCode(string url){
    Process.Start("C:/Program Files/Google/Chrome/Application/chrome.exe", url);
    Console.Write("Write the code here:");
    string code = Console.ReadLine();
    while (string.IsNullOrEmpty(code)){
        Console.WriteLine("You didn't write a code, write it again.");
        code = Console.ReadLine();
        }
    return code;
}



static async Task<SpotifyClient> GetCallback(string code,string verifier)
{

    var initialResponse = await new OAuthClient().RequestToken(
        new PKCETokenRequest("MyclientId", code, new Uri("https://127.0.0.1:8000/callback/"), verifier)
        );
    var authenticator = new PKCEAuthenticator("MyclientId", initialResponse);

    var config = SpotifyClientConfig.CreateDefault()
    .WithAuthenticator(authenticator);
    var spotify = new SpotifyClient(config);
    Console.Write("Authentication Successful...");
    return spotify;

}
static async Task Playback(){
    (Uri uri,string verifier)= InitializeSpotify();
    string code = GetCode(uri.ToString());
    SpotifyClient spotify = await GetCallback(code,verifier);
    //Controlling the playback
    
    while (true){
        Console.WriteLine();
        string state = Console.ReadLine();
        if (state=="pause"){await spotify.Player.PausePlayback();}
        if (state=="resume"){await spotify.Player.ResumePlayback();}
        if (state=="next"){await spotify.Player.SkipNext();}
        if (state=="previous"){await spotify.Player.SkipPrevious();}
        else{continue;}

    }    
}



await Playback();

I have tried using other methods and scopes such as

Scopes.UserReadPlaybackState 

together with

var playback = await spotify.Player.GetCurrentPlayback();

And that works fine. Which makes me think that maybe modification of the playback state is the problem?

Thanks in advance!