As mentioned in another comment, I have all these things configured and yet twice in that past seven days Windows 10 Pro has given me the 20 minute warning, rig

As mentioned in another comment, I have all these things configured and yet twice in that past seven days Windows 10 Pro has given me the 20 minute warning, right in the middle of my working hours. To add insult to injury for some reason the "Use a custom restart time" is now disabled. I'd love to have the annoying old windows update nag box with the postpone button back.