Sorry for the delay. It took me a while to figure out there is no MSI 2.1 cert. But I used the MSI 2.0 cert and it worked. 7 activated and so did the upgrade to 10. Dual boot working fine.
Unlike SLIC, there is no such certificate version as the marker value isn't part of the validation. For example, Dell uses same cert for SLIC 2.0-2.4.