The app ID specified within the “fb:app_id” meta tag was invalid
I tried to enable Facebook Insights for my web. I added my page's APP_ID to fb:admins to enable every admin of my page to access Insights when logged into Facebook as Page. But when I try to save the dialog message appears: The app ID "123,123,123,123,123" specified within the "fb:app_id" meta tag was invalid. I double checked my app ID and it's correct. To link Domain Insights to an app rather than a user, you need to use the fb:app_id tag: <meta property="fb:app_id" content="your_app_id" /> Source: https://developers.facebook.com/docs/insights/ Only personal IDs are allowed in the fb:admins