Tailscale Subnet router and exit node on an Openwrt Dumb AP

Installing and Using OpenWrt Network and Wireless Configuration
1

Hello

I want to create a Tailscale Subnet router and an exit node on an Openwrt Dumb AP.
Dumb AP is created as per this tutorial: https://openwrt.org/docs/guide-user/network/wifi/dumbap

Tailscale is installed on an 23.05 version Openwrt on Archer A7 as per this : https://openwrt.org/docs/guide-user/services/vpn/tailscale/start

I am unable to reach devices thru the subnet router, nor browse internet thru the exit node.

If exit node can't be used due to hardware limitation, then atleast I wanna use the subnet router but I have tried all the firewall rules, still it does not connect.

Should I change anything on the interface page?

Anyone with a working setup please please help me thru my agony!

2

New problem:
I am able to get it working as a subnet router, but I want to use it in a site to site vpn setup.
How do I do that?
What are the firewall configurations that I must do?