Thank you. This is very helpful...assuming that one has the Pro Edition of Windows 11.
For those of us (@Chris Sercombe) who are running the Home Edition, the same thing can be done directly through the Registry Editor: https://www.stefanobordoni.cloud/howto-enable-insecure-guest-logon-on-w11/
For my own part, I already solved this by adding a password to my Hello login on the offending machine that could not be reached. This is a one-time step that is described earlier in this thread.
It sounds like the combination of what's in Dennis's video and the introduction of "Hello" login that causes all of this connection problem. On the surface, it sounds like Microsoft just needs to address networking on Hello account machines. There should be exposed Settings for this that don't require this level of shenanigans.