4 players in group + 2 mercs, get task ok (4 players now in task), zone in, mercs get suspended and cannot be unsuspended.
Probably related to them "fixing" the event to prevent more than 6 people from doing it (I wasn't even aware that was thing). Sounds like they may have flagged it as a raid zone or something.
So after 3 patch / maintenance downtimes they still haven't included this in the fix? I'll bet they don't actually fix it anytime soon, since too many people are burning this event in less than 3 minutes and they want to make it harder ....