title: How to remove nbf claim
body: <p>have been looking an answer for this from everywhere, but can't seem to find one that applies to me. The thing is i'm trying to construct a JWT token with ASP.NET in c#. The problem i'm running in to is that somewhere it adds a "nbf" claim automatically to my claims and i can't seem to figure out how to remove it as the API host doesn't allow it in the token. Here's a code snipped of what creates the tokens:</p>
  
  <pre><code>               var plainTextSecurityKey = "key";
              var signingKey = new Microsoft.IdentityModel.Tokens.SymmetricSecurityKey(
                  Encoding.UTF8.GetBytes(plainTextSecurityKey));
              var signingCredentials = new Microsoft.IdentityModel.Tokens.SigningCredentials(signingKey,
                  Microsoft.IdentityModel.Tokens.SecurityAlgorithms.HmacSha256Signature);
  
  
              var claimsIdentity = new ClaimsIdentity(new List&lt;Claim&gt;()
              {
                  new Claim("iss", "smthing"),
                  new Claim("sub", "smthing"),
                  new Claim("iat", ToUnixTime(issued).ToString()),
                  new Claim("exp",ToUnixTime(expire).ToString()),
                  new Claim("aud", JsonConvert.SerializeObject(new[] { "ohlc" }).ToString())
              });
  
   claimsIdentity.TryRemoveClaim(claimsIdentity.FindFirst("nbf"));
  
  
              var securityTokenDescriptor = new Microsoft.IdentityModel.Tokens.SecurityTokenDescriptor()
              {
                  Subject = claimsIdentity,
                  SigningCredentials = signingCredentials,
              };
  
  
              securityTokenDescriptor.NotBefore = null;
  
              var tokenHandler = new JwtSecurityTokenHandler();
              var plainToken = tokenHandler.CreateToken(securityTokenDescriptor);
              var signedAndEncodedToken = tokenHandler.WriteToken(plainToken);
  </code></pre>
  
  <p>I try to remove the nbf after forming the claimsIdentity, but it appears that it isn't added there.</p>