Q: Where is Windows Server 2019 FFL/DFL? A: There isn't one. Since there was no updates or changes to the Forest or Domain functional levels of AD, there is not a 2019 level, but only a 2016 level. This is the information about Windows FFL/DFL's: https://docs.microsoft.com/en-us/windows-server/identity/ad-ds/active-directory-functional-levels This image also shows the various paths and options