Your data context is lost in the DataGrid DataGridTemplateColumn since the DataGrid. Columns isn't a dependency property. Because of this, you can't use element-to-element data binding from within your DataGridTemplateColumn.
The button inside the DataGrid has a DataContext of QuestActions since the Binding is based on the the DataGrid's ItemSource Property. That being the case, you'll need to find the DataContext of the DataGrid itself (or the UserControl or whatever parent that has the Command in it's DataContext) to get to your Command.
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