I have the lowest tier of realms, and it is behaving as though realms is full with only 2 players in the realm. The host (me) cannot join. We tried to all get out of the world and have me in first, and then the other 2 players, but it only let me and one other player in, and not the other. I am unsure what the reason for this could be, but it is very frustrating and I am less than pleased, if not shocked.
Environment
pc
Same issue, for me. Voted up.