Well, your mileage may vary. Some CMs will tell you that MBs work and some will say they don't work and some will say they don't know. When DH and I went to ride HMH last month with our virtual queue during our correct return window, we asked the CM if she could scan from our MBs. She told us without hesitation yes and then tried on each of us several times. She was very annoyed that it didn't work and apologized and asked us to pull out our phone which DH already had out as a backup. We had no difficulties before or after scanning into LL rides with our MBs that day. The CM also commented that she personally hadn't had any other guests try to scan in with an MB yet.