"Cluster network name resource 'resource_name' cannot be brought online. The computer object associated with the resource could not be updated in domain '' for the following reason:
Unable to set DnsHostName attribute.
The text for the associated error code is: A constraint violation occurred.
The cluster identity 'cluster_object' may lack permissions required to update the object. Please work with your domain administrator to ensure that the cluster identity can update computer objects in the domain."
This was due to inadequate permissions for the computer account of the Windows cluster. The cluster computer object needs the "Read All Properties" and "Create Computer Objects" permission in the domain. It also needs Full Control to the computer object for the cluster itself. Once those permissions were granted, the availability group failed over successfully.
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