How to create a Token using alg: A128KW and enc:A128CBC-HS256 in C# with jose-jwt library

Question

I'm totally new in the world of JWT. I'm using the library jose-jwt in C#. I wrote the following code to get the token:

1. I declared the payload as a Dictionary

2. I declared the key as a JSON

3. I encrypted the payload and the secretKey

        var payload = new Dictionary<string, object>()
        {
            { "sub", "[email protected]" },
            { "exp", 1300819380 }
        };
   
        var json = @"{
            ""kty"":""oct"",
            ""use"":""sig"",
            ""k"":""GawgguFyGrWKav7AX4VKUg""
        }";
   
        var secretKey = Jwk.FromJson(json, JWT.DefaultSettings.JsonMapper);
   
   
        string token = Jose.JWT.Encode(payload, secretKey.OctKey(), JweAlgorithm.A128KW, JweEncryption.A128CBC_HS256);
   

I got the following token: eyJhbGciOiJBMTI4S1ciLCJlbmMiOiJBMTI4Q0JDLUhTMjU2In0.y3NP9hx4zYmLnpab0tDVZNJ2q5aAG6BpUnMhEn11a7z903J4___LtQ.IRgLnbwqjH6m702g4Hn6QA.XCYICPsoG1dVYmEi-Nu0a4w9yzDm9__xDYT1IsxxLaZEa_tSHSJo9Ai2Ym5aN_Sw.bfH7yGqpopEwrT_O1aD1rA

When I try to decode the token on jwt.io I get the following result: jwt.io decoded token image

There's something wrong in the signature (even though I used the same in the code) and the payload is an uncomprensible string with special chars.

Thanks to anyone who will be able to help me.