Apparently, Windows 10 Home does not quite support Guest accounts.
Yes, one can activate the internal Guest account with net user Guest /active:yes
But then it does not show up in the log in screen, or it does show up, but nothing happens when you enter it.

Is there a way to create an alternative guest account?
  • Create a local account (not associated with an e-mail address or Microsoft account)
  • Somehow give it the characteristics that mimic the Guest account as we used to know it
    Note: W10 Home does not provide User Group Management
    • Advanced Registry tweaks?
    • PowerShell script?
    • ...