simple-auth-token JWT authorization not setting Authorization header

I'm trying to setup a simple Ember.js app to talk with a custom API server, with JWT authentication. I can login at the API server and obtain a JWT token, but then no Authorization header is set in subsequent calls to the API server.

My login controller is:

import Ember from 'ember';
export default Ember.Controller.extend({

    actions: {
        authenticate: function() {
          var credentials = this.getProperties('identification', 'password'),
            authenticator = 'simple-auth-authenticator:jwt';

          this.get('session').authenticate(authenticator, credentials).then(function() {
              // authentication was successful
              console.log('OK');
            }, function(err) {
              // authentication failed
              console.log('FAIL ' + JSON.stringify(err));
            });

        },
        logOut: function() {
            this.get('session').invalidate();
        }
      }
});

I can successfully login and obtain a token. My login route:

import Ember from 'ember';

export default Ember.Route.extend({

    actions: {
         sessionAuthenticationFailed: function(error) {
            console.log('Login error: ' + error.ErrorDesc);
            this.controllerFor('login').set('loginErrorMessage', error.ErrorDesc);
            this.controllerFor('login').set('ErrorMoreInfo', error.MoreInfo);
        },

        sessionAuthenticationSucceeded: function() {
            console.log('Session authenticated: ' + this.get('session').content.secure.token);

            // redirect to last route requested, or to default route
            var attemptedTransition = this.get('session').get('attemptedTransition');
              if (attemptedTransition) {
                attemptedTransition.retry();
                this.get('session').set('attemptedTransition', null);
              } else {
                this.transitionTo('index');
              }
        }
    }
});

...shows me the token is properly acquired, and correctly redirects me to my protected routes (e.g. index). Since then, if I try to get any data from the API server, it does not receive any "Authorization: Bearer [token]" header at all. My environment configuration:

ENV['simple-auth'] = {
  authorizer: 'simple-auth-authorizer:token'
};
ENV['simple-auth-token'] = {
  refreshAccessTokens: true,
  timeFactor: 1000,
  refreshLeeway: 300, // Refresh the token 5 minutes (300s) before it expires.
  serverTokenEndpoint: 'https://localhost:8000/login',
  crossOriginWhitelist:[
     'http://localhost:4200',
     'https://localhost:8000'
    ],
  identificationField: 'user',
  passwordField: 'password',
  tokenPropertyName: 'token',
  authorizationPrefix: 'Bearer ',
  authorizationHeaderName: 'Authorization',
  // headers: {},
};

I also tried manually setting the header by calling jqXHR.setRequestHeader overriding the authorize function in my login route, but with no success:

    authorize: function(jqXHR, requestOptions) {
        var auth= "Bearer " + this.get('session').content.secure.Token;
        console.log('Add authorization header ' + auth);
        console.log( JSON.stringify(requestOptions));
        jqXHR.setRequestHeader("Authorization", auth);
    }

Can anybody tell what I'm missing? Shouldn't simple-auth-token take care of adding the header automatically? Thanks for any help, al.