Based upon the [Kerberos configuration and troubleshooting guide](https://community.denodo.com/kb/view/document/Kerberos%20configuration%20and%20troubleshooting?category=Security), I would look to see if the principal is set looking like a http URL. For example:
but remember that the prefix is “HTTP/” without the colon and the extra slash:
If that does not work, and if you have a valid support account, I would open a support ticket so the support team can go more in depth with the configuration.
Hope this helps!