PS0159: The operation is not supported at the current Farm Behavior Level ‘1’. Raise the farm to at least version ‘2’ before retrying.

When running AD FS on a Windows Server 2016 you might get the error message: PS0159: The operation is not supported at the current Farm Behavior Level ‘1’. Raise the farm to at least version ‘2’ before retrying, when you try to enable some new services such as the ESL (Extranet Smart Lockout). This can …
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How to downgrade the Domain and Forest functional level

With older versions of Windows Server it was not possible to downgrade the domain and forest functional level once upgraded. However this has changed since Windows Server 2012R2, using PowerShell you can now downgrade the Domain and Forest functional level. To do so follow these steps: 1. Log on to the domain controller as domain …
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