I was finally able to get this (psexec.exe -i -s cmd.exe to work by opening the services app on windows 10 as an admin and stopping the service, PSExeSVC. I then tried this psexec.exe -i -s cmd.exe and it worked. Sorry I could not be more help.
In my post above I was trying to stop the service using PSKill so I am guessing there was an issue with that so I finally had the idea to stop the service by opening the services app as admin and stopping it. Yeah, should have done that from the beginning..