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I was able to resolve the DNS entries for this cluster with a zero in cluster0 and not an upper O.

So it looks like Azure Windows does not serve you well. B-) Being Unix old bearded man, I smiled.

This editorial comment out of my chest, I notice a weird formatting in the error message. The is no space between the cluster name and the rest of the error message. May be you have backspace or other invisible character in your configuration file. May be a missing newline.

The output of nameresolver.exe seems to indicate that the cluster name is found. Try quering for TXT entry. The default might be A entry.