When you create a Windows Server 2012 failover cluster, the following event may be logged in the System log:
When a failover cluster or a cluster role is created, a computer account (a so-called Cluster Name Object (CNO)) is created in Active Directory. Since Server 2012, these objects are flagged to prevent accidental deletion. If the main cluster resource (also a computer account) does not have the required permissions on the OU containing the CNOs (by default, this is the default Computers OU), setting the flag on newly created CNOs will fail, resulting in the event being logged.
To resolve, you can either assign the proper permissions on the OU where the CNOs are kept, or you can manually flag the CNO to prevent accidental deletion.
Note that correcting the permissions is only useful for new cluster roles. Existing cluster roles (CNOs) won't be automatically affected, and still require a manual change on each of the CNOs to prevent accidental deletion.