I have a 2012 R2 KMS host that has the CSVLK and GVLK's installed for Server 2016. The servers themselves fail to activate using slmgr.vbs /ato returning 0xC004F074. Event logs show that it attempted to communicate to our KMS host, but couldn't find a KMS
service.
slmgr.vbs /dlv shows License status Notification, and Notification reason 0xC004F056.
The KMS host returns an error "Product Key not available" even though it shows the keys as active and ready under the Product Keys section.
I have verified that there is no firewall issues, and the two systems can communicate with no issues otherwise.
I am able to authenticate all other OS and office products (no office 16 in our environment, but no issues with Win 10 installations).