PPPoE with VLAN

Hello friends.

I contracted a third ISP. It also uses GPON with PPPoE as ISP1 does, but I'm failing to setup the connection.

With ONU as router connected on my laptop I'm able to reach Internet, but connecting it to OpenWRT (as DHCP client) I'm able to connect to ONU and to laptop but OpenWRT fails to route traffic to Internet.

They are using CGNAT so I'd rather use ONU as bridge. Doing so and setting PPPoE connection, I get Unknown error (AUTH_TOPEER_FAILED) on LuCI.

There are 2 differences I see on ISP3 for ISP1: ISP1 uses the same username and password for everybody, here they use unique username. And they use VLAN 220.

What may be missing?

config interface 'wan_exs'
	option proto 'pppoe'
	option ifname 'eth1.220'
	option username 'username'
	option password 'pass'
	option metric '30'
	option peerdns '1'
	option dns '208.67.222.222,208.67.220.220'
	option delegate '0'
	option ipv6 '1'

config interface 'wan_exs6'
	option proto 'dhcpv6'
	option ifname '@wan_exs'
	option reqaddress 'try'
	option metric '40'
	option peerdns '0'
	option reqprefix '56'

Well I rebooted the router and now it connected. I made tests and traceroute is working. Odd, I'm gonna keep watch while I configure mwan3.