Ionic 2 and Devise Token Auth Facebook Login

How would one go about getting this to work with an Ionic 2 application? It seems everything is working through the browser but fails when I try to proceed with Facebook login through Ionic. Here's my Ionic 2 code to Login:

doFacebookLogin() {
    let objThis = this;
    this.fb.login(['public_profile', 'email'])
      .then(function (response) {
        objThis.authService.tryFacebookLogin(response.authResponse).subscribe(
          responseNow => objThis.loginSuccess(responseNow),
          error => console.log(error)
        );
      }, function (error) {
        console.log(error);
      });
  }

tryFacebookLogin(objParams) {
    return this.http.get(
      this.apiService.createUrl('auth/facebook'),
      this.apiService.getGetOptions(objParams)
    ).map((res) => this.apiService.extractData(res)).catch(this.apiService.handleError);
  }

And my logs from Heroku:

[d9350f73-4cbc-400c-8296-0248b2454a64] Started GET "/api/auth/facebook?accessToken=EAAFDh9WxI34BAEpTy54mVhiZCUtGDcCdQgHg8yYxIfHCk0iciDUZCsrkZAdu9SJ8vCLMZChgt7QoGZBkzvWzNkFFLhwJEcCrxtRo9dJ8ioOsErwM8h2Kv8dileZAjACZAheVg7nIxd7gKX1kZALdY2Ve7rwFxLeg0eKCYfZBBHGkjaZALkwLY1tEktsKYfrBNAR6wii2LZBoQtUEKe0Acc8ZD&expiresIn=5107217&session_key=true&sig=...&userID=xxx" for 184.145.16.206 at 2017-09-27 17:08:41 +0000
2017-09-27T17:08:41.505526+00:00 app[web.1]: [3c08d61c-4c30-4361-902a-cee8e15b63bc] Started GET "/omniauth/facebook?accessToken=EAAFDh9WxI34BAEpTy54mVhiZCUtGDcCdQgHg8yYxIfHCk0iciDUZCsrkZAdu9SJ8vCLMZChgt7QoGZBkzvWzNkFFLhwJEcCrxtRo9dJ8ioOsErwM8h2Kv8dileZAjACZAheVg7nIxd7gKX1kZALdY2Ve7rwFxLeg0eKCYfZBBHGkjaZALkwLY1tEktsKYfrBNAR6wii2LZBoQtUEKe0Acc8ZD&expiresIn=5107217&namespace_name=api&resource_class=User&session_key=true&sig=...&userID=xxx" for 184.145.16.206 at 2017-09-27 17:08:41 +0000
2017-09-27T17:08:41.507171+00:00 app[web.1]: I, [2017-09-27T17:08:41.506900 #4]  INFO -- omniauth: (facebook) Request phase initiated.

Through the app, it seems to die at INFO -- omniauth: (facebook) Request phase initiated. every single time. It never proceeds to the callback.

Any ideas? Thanks!

Start by tracing the /api/auth/facebook request into /omniauth/facebook and compare the browser flow with the Ionic 2 request shown in the issue. Use the Heroku logs to determine why the Facebook request remains in the OmniAuth request phase; done means the Ionic login reaches the callback and completes authentication.