Subnet route not working on one client

Tailnet setup on Mac, used the app version.

The dns entry returns 192.168.4.25, and the subnet route is 192.168.4.0/32

My phone works fine. My Mac works fine, my Linux works fine.

But app version won’t start at boot if no one logs on

So we changed the Mac to use the homebrew cli version. Starts at boot. 10 clients ok.

None of mine work. Mine is a shared out one machine, with that ip address 192.168.4.25

I can ping the tailnet address ok, not the 192 ip

Traceroute 192.168.4.25 on my Mac goes to my router , 192.168.2.1 which doesn’t know what to do.

Why isn’t subnet routing working? On my systems like it used to. 10 other clients working fine. Phones. iPads. Computers.