DeX setup on a portable monitor

[Android Central Question]

Hello all,

I have S21 FE where I am using Dex perfectly on my desktop monitor and laptop. However, can't seem to pull it up on the portable ASUS MB16ACV.

This monitor has two types of connection USB c and USB. I believe it has no internal battery.

Using Asus mirroring app I can mirror my phone on it (no DeX option)

Can someone help me, with how to start using DeX on it?

Thank you in advance