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So you were watching porn on your phone...and y were prompted to connect it to the Xbox? Was your system turned on? It probably picked up the Bluetooth or wtfe Xbox has. Wait no. If your Xbox is connected to the internet, that's what popped up then. Has nothing to do with 'spying'.

My system was off. I had it unplugged too lol. Just weird.

If you install the Xbox glass app, that could be the cause...