What does the seller's trained licensing specialist have to say? A 2019 DataCenter license should provide for unlimited virtual machines 2012 R2 to 2019 when using AVMA keys for activation.
https://learn.microsoft.com/en-us/windows-server/get-started/automatic-vm-activation#avma-keys
--please don't forget to upvote
and Accept as answer
if the reply is helpful--