Matchmaking seems to be broken for iron banner it keeps adding to the number 12 looking like it's going to launch and then going back to trying to fill over and over and over again.
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Same here. All friends are experiencing the same problem fireteams of 4 or more seem to experience it more depending on the number of players in the fireteam. Sometimes the "evaluated guardians" reaches full at 12 and sometimes and sometimes it resets before that.