HDR doesn't work with Prey?


I’m new to SK but I’ve got it working fine with Bioshock Remastered. I’m now trying to apply to it to Prey. SKIF works fine but HDR doesn’t seem to actually get applied no matter what I try. (I see this game is listed as working ‘good.’) I do see a message at the bottom of the HDR widget that keeps saying ‘you may need to restart the game for hdr to work.’

Is anything special needed for this game?