My route is fine and my ping has been good for me being based in UK playing on the NA servers. Around 165ms average or lower depending on time of day. Yet I still get Error 90002 inside and outside of dungeons.

I can't find any explanation for this since now my route/ping are better after using a VPN. I don't get Error 90006 anymore and I'm not lagging as much as I did before using a VPN that's for sure. But Error 90002 still pops up from time to time.

I've posted info. here a lot, but I'll do it again.

Location: Scotland, UK.
ISP: Sky.
Connection: Wired.
Platform: PC.

I have done all the port-forwarding stuff and many other troubleshooting tips the moderators have given out. None of them helped. Only after I started using a VPN did I see an improvement, yet I still get error 90002 regularly.