JWT Authentication validation in asp.net core

I have followed this link (Token Based Authentication in ASP.NET Core) to create the jwt token and I am successful to create the token

Below is the image

Now I want to validate the token I have passed the token as below

I am getting 401 authorization.Please let me know the where I am doing wrong.

I have taken the same code as mention in the blog

Here is the code link

https://github.com/mrsheepuk/ASPNETSelfCreatedTokenAuthExample

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Your problem is this line in TokenController.cs :

 var handler = new JwtSecurityTokenHandler();

you can't just instantiate a new handler for every request. You need to use an handler created using your JwtBearerOptions - when you just instantiate you don't use the signingKey you placed in Startup.cs

public TokenController(IOptions<JwtBearerOptions> options)
{
    _bearerOptions = options.Value;
}

and in GetToken

JwtSecurityTokenHandler handler = _bearerOptions.SecurityTokenValidators.OfType<JwtSecurityTokenHandler>().First();

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