ER7206 L2TP tunnel EAP standalone fails to open browser but it responds to ICMP ping
Background:
I simplified the network topology.
WORK (site - the network I'm trying to reach) - public address xxx.xxx.xxx.53
| Router | ER7206 | standalone | 192.168.20.1 |
| AP | EAP620HD | standalone | 192.168.20.234 |
HOME (client) - public address xxx.xxx.xxx.138
| Router | TP-Link AXE75 |
| PC | Windows 10 |
Following the guide from the FAQ.
These are my settings on ER7206, PC, and iPhone.
LAN

DHCP of LAN

VPN IP Pool list

Users

L2TP Server Settings

Logs in ER7206 shows success status connection from my PC (client)

Success on Windows 10 VPN Settings page.

output on ipconfig in CMD on the VPN with IP Address from L2TP connection

ICMP ping success from EAP620HD behind ER7206 (both in standalone mode)

But it fails to load or open on the web page like local connection.

Scan for ports on iPhone. No ports are opened on the VPN. Meaning I cannot open https://192.168.20.234 in VPN.

Question: How do I access EAP620HD standalone management page from ER7206 VPN (L2TP)? Am I missing something from the the FAQ?



