New Intel NUC Computer - Cannot communicate with or ping some network IP devices

I wish that was the issue, since I've had it set to "Private Network" since day one, that would have saved me a lot of time and aggravation.

So one thing that came to mind was that maybe the issue could be that I have the Netgear Router with an IP Reservation for this and 4 other computers.  While it worked fine for the others, including the one this NUC is replacing, I though maybe something in the NUC does not handle that well.  So I deleted the IP reservation, set the DHCP settings on the NUC to manual and assigned it the needed static IP there.  Problem continued.  Some devices were visible on the NUC, some where not.  Hmmm...

Finally, I FOUND THE PROBLEM and temporary solution/workaround...  Netgear Orbi's ACCESS CONTROL.  I've always had access control enabled, and set to "Block all new devices from connecting".  This allows new devices to connect to the WiFi, but then lists them as "Blocked" allowing you to either "Allow" or leave blocked if not recognized.  I mean, who knew this could be the issue?!?!  It is supposed to either block or allow the connection, not allow it and only let the device see some devices but not others..  Well, apparently, setting the Intel NUC's connection to "Allow" is not sufficient as it doesn't fully open all communication.  

On a hunch, I figured I would try disabling access control completely, and suddenly all network devices were visible on the Intel NUC.  To confirm, I enabled Access control again, the issue came back.  Disabled, the issue was gone again.

So, that is my fix/workaround for now.  I would still like to figure out a way to make the NUC's network connection work properly and fully with access control enabled, but for now, I'm happy to finally pinpoint the culprit.  

If anyone knows of any setting, etc. that can correct this behavior, I welcome your input.