I am expericiening the exact same problem with charging with my galaxy s8 plus. It chargers very slowly from a laptop but not at all from wall chargers. I have tried 3 different wall chargers and cables that work on other phones but none of them work with my s8 plus.
I have tried cleaning the usb port but that didn't work. And I am now just slightly worried that I have possibly made it worse by harming the pins.
Any suggestions would be immensely appreciated.