Sharing subnet?

Hi, I shared a subnet router node (Raspberry Pi) to my friend. He has a MacOS and I have a Windows PC. He is able to ping the Tailscale IP 100.X.X.X, but he is not able to ping the devices that are under the subnet router with the local ip device ex: 192.168.10.X, 192.168.20.X. What can be the issues?

I have added the Subnet routes to my Raspberry Pi

This is my ACL rule:
“action”: “accept”,
“src”: [" * “],
“dst”: [” * : * "],

I just found out that is not possible sharing: allow sharing subnets · Issue #1390 · tailscale/tailscale · GitHub

Is there any workaround?