For mRTW to Taiwan, I always had to use HKG as my destination (for greater MPM)
or some other "cheating/direct" routes like BR's AMS/VIE-BKK-TPE (but system only counts VIE-TPE MPM)
e.g. I was able to book YYZ-BRU-NCE,stop, NCE-(BKK)-TPE,stop, TPE-YYZ all online