I'm assuming it will last for a week, I hope. Next time I know not to help my friends (by logging in idle guests) get their achievements :(
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Is there any way I could contact a Bungie employee about this? I did not know signing in idle guests with a group of friends (which doesn't harm anybody) is bannable. I understand if the player itself (Pooperscoops for example) is AFC, but I can't see why I'm banned for my guests being AFC.