Thank you for the response and sharing the details.

If the VLAN ID is not enabled on the physical WAN port, the Virtual WAN connection must be configured with a VLAN ID.

This is not working. I have the same setup, and it throws a "Something went wrong" error.

  @Ethan-TP Did you check my last message? 

  @Ethan-TP 

How is your physical WAN configured?

The physical WAN is configured with PPPoE.

How many WAN interfaces do you have?

I have a single WAN connected to the default WAN interface and a USB modem.

If you have additional WAN interfaces, I recommend testing whether configuring another WAN works.

I have additional WAN interfaces, and I can check. The router is in a remote location, and I'm managing that with OC300 SD WAN.

What exactly is the use-case behind “It is required for the ONU access and VOIP”? In other words, why do you need to set up a virtual WAN?

I have XZ000-G7 that connects to the ISP OLT and converts the fiber to an RJ45 signal.

I want to access the XZ000-G7 web portal via the virtual WAN. One of my ISPs provides SIP VoIP through a separate VLAN, so I want to configure a VoIP virtual WAN.

I have configured the ER8411 with the HSGQ SFP PON Stick at the primary site, similar to what I want to achieve for the remote site. Please see the screenshots from the primary site with ER8411.