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):
You must be logged in to post a comment.

Thanks! This fixed the "The fully qualified domain name for node ‘DAG1’ could not be found." error.
this fixed the error.
This fixed the error for me too. Thanks!
Thank You! Its works!