I just got an Unfolded Circle Remote Two to replace my old harmony, and I was trying to add commands for my xbox to it when I noticed the Home assistant remote entity does not include commands for the Xbox button or the start button. This makes my situation unfortunately very limited as to how I can control my Xbox. I am trying to move away from IR, and having these two added to the integration would go a long way to helping me set up reliable control
You can hit those with a service call:
See the yaml code for the picture elements card of the xbox controller near the bottom here.