Getting my Ubuntu 23.04 install to run full-screen on Hyper-V

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I've installed the Lunar Lobster build as a VM in Hyper-V. I'm stuck in 1024x768.
I'd like to be able to do the full-screen option that Microsoft gives in their quick installs that uses XRDP and has always matched the resolution of my desktop (in this case 2560x1440).

I've tried a few options: I've installed xrdp, xfce4 and xorgxrdp I've used various setup scripts that have made changes to ~/.xsession and grub to no avail (like this one: https://c-nergy.be/blog/?p=18725 ) I've tried just upping the default screen resolution with some tools like xrandr and hit failures like; "Failed to get gamma size for default output". Firewall is disabled. I'm trying to walk through the differences between the setup Microsoft uses on a quick create image vs. a stock image from Ubuntu, but it's a bit tedious.

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