When I raised domain/forest functional level from 2012R2 to 2016 (successfully), my domain and forest functional level show "Windows Server". In the past it would usually say "Windows Server 2012 R2" or something like that. I know it is running as Windows Server 2016 because when I look at the attribute msDS-Behavior-Version it shows 7 (WIN2016). I am wondering is there something that went wrong with my upgrade or Windows Server 2016 does not show number for the domain and forest level?