Thank for reporting this issue. I may have found a way that you could see the hit reaction. First, open the Physical Animation map and open the project settings. Once Settings are open, click on the Input subsection. Locate the Action Mapping in the input section and click on the plus image next to it. Open the drop down and name it ‘Activate’. Then click on the plus next to Activate twice. Make one of the key values Left Mouse button and the other Touch 1 (See the attached image)
Once complete, close the project settings. Locate the ‘Player Character’ Blueprint in the content browser. Double click and open the BP. Locate the Physics Handle section in the BP and Replace the Left Mouse Button with the ‘Activate’ action that you have just created (See the attached photo for reference).