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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Were you able to connect prior to RoI? Try doing [url=https://www.bungie.net/en/Support/Troubleshoot?oid=12915]these[/url].