I cant auto keyframe a clip on adjustment layers

So I frequently use adjustment layers in Premiere, and sometimes I want to mask a clip without masking the original clip itself. So I grab an adjustment layer and open a mask in the adjustment layer's opacity effects. I mask out the person's face or whatever, and because the clip isn't masked on the original clip, the mask doesn't move with the video when I auto-keyframe it. I'm curious if there are other options than just duplicating the clip. In addition to the pictures I posted, I was simply attempting to keyframe this face with an adjustment layer, but it will not move. So any help on how to fix or change this will be greatly appreciated!