Seems to be firewall related actually. I thought exiting out of my third party firewall program (Malwarebytes Windows Firewall Control) would cause it to stop running but I think it still might be running – as if I change the profile to No Filtering instead of exiting out of it, then the viewer app is able to detect the laptop.
So I’m not sure if this is something I need to change in the built-in Windows Firewall, or the Malwarebytes one, but I’ll do some tinkering around. Thanks. And sorry for not realizing my mistake sooner.
It’s possible Malwarebytes Firewall stops running after I quit out of it and the remaining Windows Firewall is too restrictive. (which selecting No-Filtering in Malwarebytes might disable) Likewise it’s possible Malwarebytes may still be running in the background.