Convert a MP4 file with 3 audio tracks and 1 sub into a MXF OP1a

Hi,

I've got an mp4 file with 3 different audio tracks (each audio track is a language. So in VLC, I can make a right click and choose which audio track I want to play).

I need to convert this file into a MXF OP1a. I've tried via Adobe Media Encoder but the MXF file doesn't have the 3 audio tracks when published.

Is there a way to convert it and keep the different audio track in the file ? (I'm willing to use Adobe Premiere if necessary).

Thx