Facebook tab not loading on mobile devices

Olá! Estou com o mesmo problema e fiz esse procedimento e continuo sem ver o formulário pelo facebook no celular!

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Unfortunately, Facebook does not support Tabs on the mobile website.

What you can try is adding a direct form link as a Contact Us button on your Facebook page.

Alternatively, this is possible to embed the form with a 'Static HTML: iframe tabs' Tab App:

Adding a form to Facebook (Custom iFrame App)

They provide a special Tab link for mobile devices.

Then, you can also use that mobile Tab link as the Contact Us button link.

If you need any further assistance, please let us know.