Mikrotik Routeros and UPnP Setup problem

Hi. I have some problems that need you to help :<

I am setting up UPnP on routerOS with my best wifi routers and have a question that I cant seem to find the answer to anywhere,
I have an ADSL2+ modem bridged into physical interface “ether9 ADSL”
And a PPPOE virtual interface set up, this all works correctly.

I just dont know weather i should set my external UPnP Interface to be the pppoe or the physical interface?

Image below for clarification

Also is there any way to test if this is working correctly?
I’m trying to troubleshoot some Playstation 4 connectivitiy issues.
Thank you

The pppoe is your external Connection, there are no ip / routing information bound ob the ether9