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Why is my Facebook app in a Page Tab not appearing to non-admin users?

I have a Facebook app running in a Page Tab (the tab of a Facebook Page for an organization). The Page Tab URL (and Secure Page Tab URL) points to a URL on my own server which holds a PHP page that contains an iframe of a Google Calendar.

The app works perfectly fine when I open the Page using the admin account (both http and https). But when I open the Page using the user account of someone who has 'Liked' the Page, the app does not appear at all (both http and https). Any suggestions? Thank you.

Solution

  • Check if the app is in sandbox mode, in the Advanced section of the Settings here:

    https://developers.facebook.com/apps

    I believe that is the problem.