I was just about to aks the same question, as I was under the impression that 8.1 did support it; however, after installing SIM and then running it, it states in red that it is running on an unsupported OS... :-(
As other systems management vendors already support Server 2016, and as this OS has been out for a while now, not supporting this OS causes complications for customers that have a mandate to move away from Server 2012.