I get an Exception message when I run the UWP building on the X64 platform, please see the attch, and the UMP building is build by unity 2019.3.3 and vuforia 9.0.12.
Could you please first try and run the Vuforia Core Sample app from the Asset store on the UWP device? Also please confirm which UWP device are you using?
In regards to your process, do you just build after the export from Unity or do you make additional changes?
Vuforia Engine Support
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