When you try to connect the App via the Connect Data button, you may receive an error as shown in this video.
The workaround is to connect via the Dataset settings. This video will show you how.
If your Facebook page’s URL includes a dash followed by a long number, please use the long number as your parameter (For example: For the page https://www.facebook.com/Autoverohaku-316194059057427, the paramater should be 316194059057427 and not Autoverohaku-316194059057427. Otherwise, you may experience the following error when you try to connect the template app: