Hi @ngothoai,
Are you getting “No shipping methods” this message? If yes, this message usually occurs:
-When the product weights & dimensions are missing
-Invalid/Incorrect credentials
-Incorrect shipper/destination address
Can you please ensure all the above setting up are configured correctly and then try again?
If you still face any issues, please provide us the FedEx Request and Response. We will check with it and help you.
You can refer this video to get FedEx debug info: https://www.youtube.com/watch?v=Vy0joJQRhbU