I have just moved house and last night got my ATV Generation 3 all hooked up and just tonight I went to turn on Airplay Mirroring on my iPhone 4S (running lastest version of IOS). Well I came to discover that Airplay Mirroring wasn't there and after that I went to make sure everything was working so I restored my ATV, to no avail. And after that didn't work, I disconnected both devices on my network, then reconnection them, and by the way my router is a Linksys X3000 (same as before I moved). Before I moved everything was setup the same only I was running the previous version IOS (my stuff got put in storage while I found a place).
Also, when I went to Airplay music (not mirroring) on my iPhone, it worked perfectly. So now I am unsure of what the problem is. And when I went into iTunes on my MBP 2011 model, Airplay worked like a charm.
And now before you ask, I have Airplay turned on, on the ATV and I have the Remote app installed.
Here is some photo evidence to help better answer my question:
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