For my guild we got 1 star in each of the zones of phase 3 before phase 3 ended. When phase 4 started, the middle territory never unlocked. The top (ships) and the bottom territories are available and the center territory from phase 3 is still available. I just attempted to deploy a single low level toon to phase 3 center and it deployed. Now when I check phase 4, that toon is not available to be used or deployed.
If the phase 4 center territory is supposed to be locked for some reason, there is no indication why.
I also went back and checked; we also had not reached the star for the center territory of p3 before it ended. We ended up getting that star a few hours after p4 started. It makes sense that you have to get at least 1 star to advance (I guess) but there's got to be a better way of indicating what's going on.
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That will probably be your guilds best chance at adding a star before the event ends.
If the phase 4 center territory is supposed to be locked for some reason, there is no indication why.