iPhone XR will not charge nor turn on

Take look at the article below with some troubleshooting steps to help with what you've been experiencing.

If your iPhone or iPod touch won't charge

Have you tried using a different charger with the device? ( preferably an Apple one ;) ) It could be your charger.

Additionally, the device could be completely out of power (the dead battery screen is more of a power reserve mode so that you don't lose any work-)