• The iPhone XR charges slowly or not at all.
• The iPhone is not charging beyond 80 %.
• An alert that shows that the accessory you are using to charge the iPhone is not certified or supported.

These are the most reported issues for an iPhone XR with faulty charging. You may try some home fixes that may resolve the issues.

• Try changing the wall adapter or cable.
• Check if there is no debris or dirt in both the charging dock and the charging adapter.
• Make sure the USB is connected firmly on both ends.
• Check the charging adapter or the lightning cable for visible signs of damage. Example: Bent pin, loose cable, etc.
• if you have iOS 14 or above make sure you uncheck the “optimized battery charging” option to make sure it charges beyond 80 %.