I just installed Tailscale on a Raspberry Pi 4B for a test run prior to doing the same on a Pi 3. I configured it as a subnet router. I had a few issues with IP Forwarding warning messages but they are another matter and I got past them OK.
The issue I have currently is that whilst the Pi is connected to my Wifi Network, I cannot see that device in my Router’s (RT-AX86U) list of connected devices. I can see it in the Router’s “System Log - Wireless Log” so it is definitely there.
Is this a Tailscale issue for subnet routers; just a networking issue in general; or an ASUS issue; or do I need to enable something to see it?
[EDIT] My Routers IP is 184.108.40.206 and I set up Tailscale with
$ sudo tailscale up --advertise-routes=192.168.9.0/24