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Clients cannot open the landing page on a mobile device using Facebook app?Asked by Postmarketing on May 04, 2015 at 12:29 PM
i've been recieving email from clients claming they cannot open the form on a mobile device, they claim that facebook asks them for their login information and then the link never loads
Are you referring to the mobile app of Facebook? Unfortunately, I believe the page tab is not supported in the Facebook mobile app that is why it is not being loaded.
But there's a workaround that you can use, you can try using the static HTML and add the embed form code there. Here's a guide that you can follow: http://www.jotform.com/help/82-Adding-Form-to-Facebook-Custom-iFrame-App-.
Do let us know if I misunderstood your concern.