Samsung need to fix a real problem in it's Phones.
My note 9 and a lot of Samsung Phones including new flagships, sometimes keep alerting "Moisture has been detected" in the charging port, even if there's no water in the port.
Why Samsung does not put a cover on the Usb C port? It's a nice idea
kindly note that Samsung devices will not charge if moisture is present in the charging port when it is plugged in. This is a preventative measure added to avoid corrosion, and you will still be able to charge with a wireless charger on supported devices. A popup message will display in the event a charger is plugged in while moisture is present in the charging port.
as we recommend you to follow the below link to guide you through some trouble shooting steps , as if you faced the same issue then service is needed
