Tailscale Subnet Routing to WAN Network

Hello OpenWrt,

I successfully installed OpenWrt 23.05.4 on my Glnet GL-MT3000 router. The router is plugged into the ISP router (using it as a main router is not an option).

I have set up tailscale, and I can use the tailscale node as a exit router.

What I can't do, and have been trying to get working for the past two weeks, is access devices on the OpenWrt LAN (192.168.1.0/24) and WAN (10.0.0.0/24).

Here is the network diagram, OpenWrt Interfaces & Zones and Tailscale settings:

Tailscale was started using this command:

tailscale up --accept-routes --advertise-exit-node --advertise-routes=10.0.0.0/24,192.168.1.0/24 --netfilter-mode=off

So in summary:

I can access the internet via. tailscale (so the exit node functionality is working). But I cannot access the 192.168.1.0/24 or 10.0.0.1/24 subnets.

Can anybody see where I am going wrong?

Edited: Tried to make diagram easier to read, as a new user I can only have one image in a post.

Does anyone have any ideas that I could try?