I've been having the same issues with my partner. We've tried two separate routers. We've reconfigured our our router several times. We've factory reset our routers several times. We've enabled port forwarding. We've enabled uPnP. Everything that Bungie has told us to do to fix this issue. We've even done suggestions from other players. This crap is getting old Bungie. Before the patch before ROI we had zero problems joining before. We game share as well. Could that possibly be a problem that's interfering? Would purchasing another copy of ROI fix an issue?