Need to get access behind the router Via Zerotier

I need to get Access of my site network, I have router with ZeroTier Installed at site and I can access my Router remotely. Could you advise what should I use to get the device access after my Router.

Port forwarding is not working for the connected device, Device is in same range of my Router network.

Hello,
we have this article
https://zerotier.atlassian.net/wiki/spaces/SD/pages/224395274/Route+between+ZeroTier+and+Physical+Networks

does that help? You can also install zerotier on some routers. That’s a little more convenient if it’s possible.