Overriding pivot style in UWP

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XAML

WPF

style

UWP

I copied and pasted all the code on this page (https://msdn.microsoft.com/en-us/library/windows/apps/mt299144.aspx) into App.xaml verbatim, but the application crashes and no information is given as to why. When I remove the overrided template from the style alone, it no longer crashes, but then I can't override the template.

What is the deal here? I've never had this issue when developing classic desktop apps, but UWP seems to make this unnecessarily complicated.

Note, I am developing with UWP.

What I have tried:

Exactly what this article (Pivot styles and templates - Windows app development[^]) told me to do.