I thought I was going mad, I've been trying to get this to work to fix the issue with VMWare Horizon where user sessions are stuck logging off https://kb.vmware.com/s/article/2151503 but the key seems to do absolutely nothing, I've been searching for hours with no one reporting any issues to finally find this post!
I wonder if this is a Windows update, or it's just not present on some versions?
I know this is a bit old now, but if anyone else is having issues with the AutoEndTasks setting not working, could I ask what Windows build you are using?
We are on 1809 LTSC, OP seems to be on 1809 as well?
Thanks!