iPhone 10xr will not charge

Are you using apple certified charger??

if not you’ll get error “this accessory may not be supported “

check this link:-

If you see an ‘Accessory may not be supported’ alert - Apple Support

If you are using original iPhone charger and there’s nothing worry about your charger then check the port if all seems fine but your iPhone won’t charge,

refer this link:-

If your iPhone or iPod touch won't charge - Apple Support