Dear Samsung Member,
Greetings from Samsung Customer Support!
Please perform the below mentioned steps to resolve the issue:
1. Check connectivity
Please check whether the charger cable and adapter is fixed well. Remove charging cable and reconnect with mobile phone properly.
2. Kindly check the power socket functionality with a different device or try to charge the device in a different power socket.
For further assistance, register your concern in Samsung Members Application (Open Samsung Members Application > Get help > Send Feedback > Error report/Ask questions).
Thank you for writing to Samsung.
Samsung Customer Support