When you don't have the cluth pushed in the throwout bearing is sitting "idle" and assuming everything is adjusted correctly will not be touching anything and will make no noise. If it made noise when you pushed the clutch it that could be the throw out bearing. Not a BMW tech but if it were an older Honda the first thing I would thing of is the trans front bearing. So at this point there's several places you could start finger pointing, pilot bearing, trans front bearing, clutch disk.
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