No JWT detected - Amazon Connect Chat

Question

I am integrating AWS Connect Chat with my app and I get this error:

No JWT detected

I have searched for this error everywhere but I have not come across it, does anyone know how I can go about it? Here's the code that introduces the error:

amazon_connect('authenticate', function(callback) {
      window.fetch('/support/token').then(res => {
       callback(res?.data);
      });
  });

For the token, I am using JWT.encode to get the token then I Base64.urlsafe_encode64 the token. When it it's my route, I Base64.urlsafe_decode64 the token first. Anyone see what I'm doing wrong? Any suggestions will be appreciated! Thanks.