cant connect my iphone to apple tv, suddenly stoped working

Hi all,

My connection between my iphone, itunes and apple tv has suddenly stopped working.

On all of my devices and itunes home sharing is on, I've looked everywhere on help and feel like i've tried everything.

Even when I go to add my itunes library from the "Remote" app I can't find anywhere on itunes to put my passcode into.

Thanks in advance for anyone who gives advice or fixes this annoying problem!!