We have two PS4s on the same network. I have some ports forwarded to my roommate's console, and some to mine to allow us both on. He hasn't gotten the message a single time (he owns the house, he got 2/3 ports) and I get it every 5 minutes. We've tried with uPnP. Without. With forwarding. Without. No matter what we do I get "Contacting Destiny 2 Servers" every 5 minutes. This is the [i]exact[/i] same configuration that we used during the beta and it worked completely fine. The issue didn't happen once during the beta, but now Crucible is virtually unplayable for me. I've even been kicked from PvE twice now, although I was able to reconnect. I followed Bungie Helps rules of "uPnP MUST BE ENABLED" without port forwarding and that actually made it worse.
And yes, I know how to port forward correctly. I work in networking as a career, and it was never an issue, not even during the beta, until just now when the game released
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I have the same exact issue with my roommate, nothing will work. There should have been a notice for people buying this game to not play it under the same network connection as someone else.