VPN between AWS and Unifi USG -- 2

I am supporting a smarthome customer who is using Unifi devices. I am new to Unifi products, looking for some help to setup the VPN between AWS and the customer location.

Customer has USG 4 Pro at the edge, behind this USG there are 15 houses each got USG-3Ps.(NATted). I tried to create S-2-S IPSec VPN but partially succeeded.

We are running a NOC; monitoring customer devices via SNMP, our NMS is in the AWS cloud. I was able to bring the tunnel up when I terminated the VPN at the Edge USG 4Pro but only able to reach one subnet( default LAN: [login to view URL]) that is in that USG 4 Pro but not any other subnets behind the edge USG.(NATed)

We want to reach the managemnt IPs of those devices in each units.

I am attaching the topology with 2 units.

Hope I can get the solution here.

FYI, customer using Hostifi controller to manage their sites.

Taidot: Järjestelmänvalvoja, Linux, Verkonhallinta

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Projektin tunnus: #29087302