Ok I think I have resolved the issue. It appears that if you do not activate either a paid license or the trial, it fails with the import because many of the features are not active until you enable the license and then update the XOA appliance.

Once I activated the trial and then updated the appliance again, I was able to successfully import the backup.

My hesitation with activating the license before importing the config as the licenses are bound and I didn't want to have to redo the setup if the config did not import.

Again, it looks like I need to activate the license first and then I can import the config.