None of the examples run: Requires latest version of Google Play Services for AR: Your device isn't compatible with this version.

[n1cholson]

The application builds and stalls OK (Unity 6.3) and even starts.
When clicking any of the example buttons, a notice appears "Requires the latest version of Google Play Services for AR"
If you click continue, you see a message "Your device isn't compatible with this version"

Tried deleting Google Play Services cache and data
Tried deleting Google Play Store cache and data

[LevanaChen]

It seems your project has enabled ARCore under XR Plug-in Management instead of OpenXR.

Could you try to disable ARCore provider and follow sample README.md to set up individual samples then try it again?