Thank you guys !

Actually, it seems somehow my language settings were reset (probably because i changed computer), so they weren't on japanese anymore.
But now i changed them back and i get queued in dungeons in less than 5 minutes !

I'll just do the ones i haven't done yet for fun and then do the MSQ like you recommend.

Let me know if there's anything else i should be aware of, since i haven't played the game for ages !