My iPhone charging port not working properly

You will need to take it to Apple for diagnostics. It could be:

• Charging Port
• Cable
• Battery
• Charger

iPhone Repair & Service - Apple Support

If it is another issue, then please describe the details. There are only a couple of Settings that will affect charging, such as the 80% limit that will stop charging at 80%.

Set up a genius bar appointment at your nearest Apple Store or authorized service provider to have your iPhone diagnosed and repaired.

click here ➜ iPhone Repair & Service - Apple Support