A/c Compressor noise ane Feedback Knock

Hey guys, I have a 2016 base wrx I've recently been having problems with my A/C Compressor it's making alot of noise at idle and doesn't not cycle the clutch wheel which blows air temp air while parked. When I'm on the highway it works fine the clutch wheel cycles and air blows cold, but I know their is something definitely wrong with the compressor. Also when I'm driving in the city since the a/c is making alot of noise I'm getting a really high feedback knock reading on the cobb accessport up to like 10.0. When the a/c is off I have absolutely no knock. Anybody have ideas?