Originally Posted by
CPH-Flyer
I don't truly know if Business Suites from a booking class perspective counts as first class or as business class. Malaysia Airlines rewamped their first class to business suites, so it will depend on how they positioned that to their partners. Can you see the booking class code?
So depending on how it counts, you get business or first class lounge.
MH uses JAL Lounge at HND. If it treats that as F, OP will automatically have access to JL F lounge based on the MH flight alone. Doesn’t really matter how JL treats the flight
IF MH advertises that as a first class that comes with first class lounge access.