Configure 2 PPPoE wan trunk port

Question

I have 2 routers from the same ISP but different public IP that works with PPPoE and I need to connect both into the same firewall (Watchguard).
Both PPPoE have the same user, password and VLAN, so I don't know how to do it.
I tried to configure a switch with 2 access ports with different vlan (6 and 7) and a trunk port with both vlan tagged.
The firewall port has both vlan tagged to and the pppoe configuration is correct, but I'm unable to get the public IP on the firewall interfaces with this configuration.
Maybe PPPoE cannot be configured into tagged vlan or a trunk port?

This is the de schema:

And this is what I get into the Watchguard interface status:

Thank you.

Regards,

Zac67 · Answer

You need to use two WAN interfaces on the Watchguard and connect each router seperately. You cannot use tagged VLANs when the other end of the link isn't configured in the same way.

If the devices are spaced further apart and you need VLANs to splice that into your normal network, you can connect one VLAN for each ISP router untagged on each router uplink, tag them across your network and untag them towards the Watchguard using two interfaces. Very likely you can also configure a VLAN trunk to the WG and tag the "WAN" VLANs on both sides.

Configure 2 PPPoE wan trunk port

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