Green screen chromakey filter not turning gray or black in background under effects filters

Hi everyone,
my green screen wont turn gray or black when i apply the effect filter on it and its very fuzzy looking too. I dont have alot of good lighting either so that may have something to do with it too. Im now to this. I just updated obs to version 29.0 so its what it is.i need some help making it look and work properly if possible. If anyone could help and let me know what I should do itd b great thanks again.