I just want to say ZOS, this is the most frustrating and ridiculous process I've ever seen in the 4 years I've played this game. Guild wants to group for EP action. How do you join? Where in the entire menu do you join a campaign? 15 minutes to find "Oh, it's on a second tab of a screen! Of course!" Join. Ask to travel to leader. NOPE! Can't port to that location. Why ask? No part of how you travel around ESO is how you travel in cyrodiil. Can't port. Can't get to sewers. Oh, a dungeon, I'll port there and walk out. NOPE! Ported out of pvp and out of campaign.
Get your ux folks on this and figure out an easier way to get people into cyrodiil and you might actually have more people participate. Explain this process in your ui. Explain how to get to the sewers without an hour fight to get there.