Need help using tap dev mode with OpenVPN for upnp support.

So my uni needs proxy to connect to and only allows traffic via TCP 443 port. Since I have an xbox, I want to connect it to the internet. I use openVPN and get config files from TCPVPN. However, all of these use *tun* dev while xbox requires NAT and upnp, which apperently works with *tap*.
My xbox says connected, downloads games, but says:
NAT – Strict
uPnp – Unsuccessful

Where do I get *tap* dev VPN config files? What am I supposed to do?

Here is my set-up:
I connect my laptop to the uni wifi, then I set up my VPN with OpenVPN, then I share the LAN connection made my the VPN with my ethernet port which is connected to my xbox.

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