I can't connect to my brother's Ps4 we are connected to the same router and I can not join his fireteam we are unable to. We have the same content and DLC.
Fixed-UPnP was not properly enabled. Router Settings must be saved after disabling and re-enabling it
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I see this a lot here, sounds to me like it's a PS problem and not destiny. I play on Xbox one everyday with my girlfriend locally. We have 2 Xbox ones on the same network, never had an issue since day one.