Join Date: Dec 2006
Location: Pacific Northwest
Programs: UA Gold 1MM, AS Plat, AA EP, Bonvoy Plat, Hilton Dia, Hyatt Glob, IHG Plat, ...
Posts: 21,424
I am not in Vietnam, but I have logged in without issues from various European countries.
What message/error are you seeing?
Have you tried a VPN?