Hello! I need help in configuring the Wireguard or routing tables to be able to access a remote vpn site. I am new to networks

Here is the setup and what I have been able to configure

Main site with Static IP ER7206

Remote site ER605

Configuration via Omada

Main site and remote site is connected via L2TP vpn as network extension mode. So, I am now able to access the devices in the remote network from the main netowrk no problem. Both have different subnets.

Secondly, also configured a vpn l2tp for windows pc. This is also working and can access all devices across the main and remote site devices.

For Wireguard, I need to setup for use with android 13/14 as I am not able to successfully  connect my android using Ikev2/PSK.

Currenty in wireguard, I am able to access the devices in the main site but not the remote site. I need to be able to access across two sites similar to the L2TP setup.

What could be the problem?