Tailscale is also up and running on my Mango and I went through the same process.
My Mango appears on the Tailscale machines list on the admin console.
The problem is that I can't acess my home server through a phone connected to the Mango's wifi (which is connected to the Tailscale VPN). However, when I try to acess my Mango router trought my phone (wihch is now connected directly to the Tailscale VPN), I can acess it.
Why can I acess the Mango with the other Tailscale devices, but I can't acess the other devices (in this case the home server) with my Mango router?