I'm not really familiar with this system, but most good garage openers use some sort of rotating code. Every time the opener is used it switches frequency for the next time. Without having the algorithms no other unit knows where to go (security feature - to keep thieves with scanners from intercepting your code for future use).
I presume the MB feature can only reproduce a single frequency. Just a guess.
Bosch Master, ASE Master, L1
33 years MB technician