Remote L2TP VPN to Access Google Cloud Server

Good evening. The closest thing I saw on this forum was someone wanting to do something similar with Azure, but was on the Nebula.

Have a Zyxel USG40 connected to Google Cloud Services VPN (IPSEC Tunnel). Everything is working here and no issues

Google does not have a direct remote worker VPN setup to access their resources so i wanted to allow remote L2TP VPNs to somehow policy route to Google services

Local Zyxel network 192.168.0.0/24 Google Cloud Services Network 10.128.0.0/20

Remote L2TP address pool is 192.168.50.1 - 250

I set a policy route with Source Address of RemoteAccess_L2TP_Wiz_Client and Destination of GoogleCloudSubnet2 (10.128.0.0/20) next Hop was the GoogleCloudVPN2 IPSec Tunnel.

I have tried that and other combinations and still cannot reach the Remote desktop server at 10.128.0.2

Does anyone have any recommendations?

thanks in advance!