Server2012: Adding DAG Member Results in 'The fully qualified domain name for node 'EMEA-SWEEX15-01' could not be found.'

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To get around this, add the permissions by following this article for pre-staging the Cluster Name Object for a Database Availability Group. If you still receive the error, modify the 'dNSHostName' attribute to reflect the FQDN of your DAG, as referenced below from my lab (suffix removed from screenshot):