Looking for help fixing issue with datagrid and grouping

This morning, I posted a question seeking help with assisting me in understanding how to resolve an issue I am having with a data grid. I received some advice on how to set it up, and either I am completely wrong in understanding, or took a wrong turn somewhere, because it isn’t working.

As you can see in the post, I have provided the appropriate XAML and code in my constructor. Having some help would be incredibly helpful, because not only is MVVM new to me, but I have been going at this issue for a few days now and am getting burnt out trying to solve it. I am aware of this page on the Microsoft docs, but it seems completely different in setting it up. I don’t understand it in the slightest.

So yeah, if someone would be willing to help me out here, I would be incredibly thankful!

submitted by /u/TimeTravelPenguin
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