Why does AO jitter?

Hi, I have been trying to use the post process effect of AO through a post process material. (That way my entire game displays as though it’s AO). The issue with that it seems is that everything is jittering. I have narrowed it down to the AA method. When I switched it from Temporal AA to FXAA or even OFF then the jittering stops. Unfortunately this does not fully remove the problem, there are still some spots that have jittering and noise. Are there other AA methods available? Or is there a way to fix this not through AA? Thanks!

I could be wrong, but I’m fairly certain that AO in UE4 is done (still) in screen space, which means that it processes every frame and hence, will jitter. Temporal AA jitters by its very definition so it makes sense that changing it would help that.