Fast charging for Nokia 6 is 5V 2A. You can check with USB tester, how voltage is in output and how many amps the device is charging. You can try charging with another adapter. https://youtu.be/0S45bIW705M https://youtu.be/tIaHg6M_y7w This videos are about bad chargers. If you have one of those, please put this into trash and buy another.
