The error code is 006-0612Give use Error code, Console's region and game's region.
With those informations we should be able to help you.

http://www.nintendo.com/consumer/wfc/en_na/ds/results.jsp?error_code=006-0612&system=3DSThe error code is 006-0612
Region JP and the game region us ,and i try another game MHU 4 and still the same problem
Did you accept US online EULA? (you have accepted JP one as you have a JP console, but your game is US)The error code is 006-0612
Region JP and the game region us ,and i try another game MHU 4 and still the same problem

Do you any actual region settings set through Luma3DS?oh sorry i meant my 3ds Region is US, i try another game bust still same and try chose another configuration of Luma