I am currently experiencing a routing forwarding failure (timeout) when using two routers for network interconnection and would like to seek technical assistance.

【Hardware Environment】

Router A: Archer AX23 (IP: 192.168.0.2) — WAN connected to the general external network, OpenVPN Server enabled.

VPN Subnet: 100.0.8.0/24

Router B: TL-R470 (IP: 192.168.0.1) — WAN2 connected to a closed network (10...*).

Connection Method: The two routers are connected via a LAN port.

【Router Settings】

AX23 Settings: A static route 10.0.0.0 mask 255.0.0.0 has been added, pointing to 192.168.0.1.

TL-R470 Configuration: A static route 100.0.8.0 mask 255.255.255.0 has been added, pointing to 192.168.0.2 (Interface selected: LAN).

【Problem Description】 After an external device dials into the AX23's VPN, it cannot access resources in the 10...* network segment through the TL-R470's WAN (connection timed out).

I have tried disabling the firewalls on both routers, but it is still ineffective.

Key Point: The same network topology and routing settings work perfectly on older models (Archer A9 and TL-WR840N), but fail with the AX23 and TL-R470 combination.

What additional settings need to be configured on the TL-R470 to allow the AX23's OpenVPN to communicate normally with WAN2?