JWT token creation in asp.net

Description
Create token in asp.net using JWT,

Error
Invalid Token

Which App Type (OAuth / Chatbot / JWT / Webhook)?
JWT

Which Endpoint/s?
How to create Zoom Token to create meeting using JWT authentication,

How To Reproduce (If applicable)
Steps to reproduce the behavior:
Please find the code below iam using

       string key = "xxxxxxxxxxxxxxxx";
       // Create Security key  using private key above:
       // not that latest version of JWT using Microsoft namespace instead of System
       var securityKey = new Microsoft
           .IdentityModel.Tokens.SymmetricSecurityKey(Encoding.UTF8.GetBytes(key));

       // Also note that securityKey length should be >256b
       // so you have to make sure that your private key has a proper length
       //
       var credentials = new Microsoft.IdentityModel.Tokens.SigningCredentials
                         (securityKey, SecurityAlgorithms.HmacSha256Signature);
       var header = new JwtHeader(credentials);
       var exp = "1516239022";
       //  Finally create a Token
        Header = "{\"alg\":\"HS256\",\"typ\":\"JWT\"}";
       var Payload1 = new JwtPayload
       {
           { "iss ", "xxxxxxxx"},
           { "exp", "1516239022"},
       };
       

        var secToken = new JwtSecurityToken(header, Payload1);
        var handler = new JwtSecurityTokenHandler();

        // Token to String so you can use it in your client
        var tokenString = handler.WriteToken(secToken);

        Console.WriteLine(tokenString);
        Console.WriteLine("Consume Token");


        // And finally when  you received token from client
        // you can  either validate it or try to  read
        var token = handler.ReadJwtToken(tokenString);

Additional context
Can you please provide any sample to generate JWT. We created the JWT successfully using https://jwt.io/ but getting invalid token when we integrate in our code base

Hey @sv003,

Please use one of the libraries from jwt.io. Just scroll down to see the list of libraries.

Thanks,
Tommy