Mikrotik RB2011UiAS-RM PPPoE doesnt work

I have an Mikrotik RB2011UiAS-RM Router with OpenWrt.
My Provider is A1 (Austria) with a provided Router (Model: A1 VV 2220).
I set the A1-Router to Single User Mode (SU) to use it as a modem.
Now I am trying for hours to set up a internet connection via PPPoE, but I cant get it running.
I always get the message: "Timeout wating for PADO packets" or "Device not found"...
I also read that normally in OpenWRT Status->Overview there should be an information box about dsl, but I dont have that one.
It would be really nice if someone could help, I am out of ideas.
Thanks and greetings,

You apparently need to tag WAN with VLAN ID 2:

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