Supported Server OS for SolidWorks License Manager

We just upgraded our License Manager from 2017 SP01 to 2019 SP02, as we are running Windows Server 2012/2016 and read that we would need Windows Server 2019 to go any higher. I can't locate the article I read; can we get confirmation that is the case?  I think I read it on a message board but can't find the official word from SolidWorks.

Thanks.

SolidworksGeneral