Using concrete5 page within facebook pagetab app concrete5 v8

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Hi,

if I try using a concrete5 v8 (https://www.kosmetik-kastellaun.de/terminvereinbarung-fb) as a facebook pagetab (https://www.facebook.com/KosmetikKastellaun/app/547643612004315/) I get a X-FRAME-OPTIONS error. I already allowed facebook in config file with the following array:

'misc' => array(
            /**
             * Defence Click Jacking.
             *
             * @var bool|string DENY, SAMEORIGIN, ALLOW-FROM uri
             */
            'x_frame_options' => 'ALLOW-FROM facebook.com/KosmetikKastellaun'
        )


Can anybody help?

mst