Vietnamese keyboard

The Windows inbuilt Vietnamese keyboard seems not compatible with Memrise, or the other way round. Every time I try typing IME Vietnamese with the IME, Memrise markes red my otherwise correct answers

Vietnamese is not the only language with this ugly problem. The same was mentioned in here about Korean, if I remember well.

Are you doing with pc or phone?

I am using whe web, obviously, I did write “IME”