Auto Masking Tool Issues - Not Revealing Mask After Tracking

Good day. I have been trying multiple clips to recreate the process I have seen in videos for using the auto-masking tool. Here is the scenario. I choose the Auto Mask Tool. I select my subject. The subject is red and outlined. The mask 01 shows up in unassigned masks. I choosed track forward and back. It completes. I click on the mask and there is no outline or indication of the mask on the clip in the viewer. I drag the unassigned clip down to Opacity. The tracking keyframes show that the mask has moved successfully. I click invert, and the entire clip turns to black. There is no evidence that the mask affects the clip at all. Please help.