I have the same problem today and I could not join the TdZ Ride that I scheduled for 11 am though I was online and spinning (TCI 2015 course) for 10 minutes…the top right window showed that the ride would start in xx minutes but the prompt never came to join the ride. Closed Zwift and restarted again but same problem Eventually gave up. I have Asus router with Astrill vpn but that has not stopped me from riding last 6 stages…for today’s ride I never got a prompt. THIs has happened before and I gave on that ride too. I see this port-forwarding solution many places on internet but seems like Zwift is meant for IT guys only who can do this. For others like me you are lucky if it works otherwise looks for some other platform…so disappointed.