@MatthewT17 Any home router model can be set in AP mode and configured with the same SSID as your existing AX72 Pro (connected to ER605 LAN port).

@NigaroMatsu For this purpose you'll need a business grade router like these here. ER605 would be a good choice.

@TTurtle Archer AX50 doesn't have a wireless repeater feature implemented - it only has AP mode (Case 1) feature. It also doesn't support any mesh feature, but you can still name its SSID the same as...

@brand5 A similar behavior could be observed if the router has its UPnP feature enabled. Disable UPnP and reboot the router, then try to port-forward TCP 80 again.

@Beard You can browse the system log, but once the RE is restarted all logs would be gone:

@tomycrosound Yes, there is - details. AX1800 is just a designation of the wireless standard AX (Wi-Fi 6) and the combined wireless bandwidth (2.4GH & 5GHz) 1201 Mbps + 574 Mbps ≈ 1800 Mbps.