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Can you grab the mech and force it to move a little. Like, not enough to snap it but try forcing the parallelogram to move by hand. You've double checked the B-screw stop already? If it moved too far once it can be in a position that won't allow it to move normally. Force it with your hand up the cassette a bit and see if it frees up.
Doesn't have to be on the bike, just make sure it can move.
hippy
And yeah, the mech moves a little. As I said, more like microadjust than anything though