AD FS Farm Behavior Levels

In AD FS for Windows Server 2016, the farm behavior level (FBL) was introduced. This is farm-wide setting that determines the features the AD FS farm can use.

The following table lists the FBL values by Windows Server version:

Windows Server VersionFBLAD FS Configuration Database Name
2012 R21AdfsConfiguration
20163AdfsConfigurationV3
20194AdfsConfigurationV4

If you are upgrading an AD FS 2012 R2 farm to 2016 or 2019, the farm upgrade requires the AD schema to be at least level 85. To upgrade the schema, With the Windows Server 2016 installation media, open a command prompt and navigate to support\adprep directory. Run the following: adprep /forestprep