Facebook App not showing in a page but showing in another, why? -

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i've created facebook application , test fan page. added app fan page (test page) , created tab in page. when added same app page didn't create tab. know why? app tab name set correctly , not conflict other tabs. both pages have basic facebook apps added them , nothing else.

am missing something?

looks forgot set tab url field in app settings. once fixed it, removed application , re-added it. worked fine


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