Toasterman:
From the documentation:
unknown [...]
The domain has a configuration error in the published data or defines a mechanism that this library does not understand. If the data contained an unrecognized mechanism, it will be presented following "unknown". You should test for unknown using a regexp /^unknown/ rather than eq "unknown".
So I'd suggest checking checking the configuration of your server (if you control it) or contacting the sysadmin to find out if there are any configuration problems. If it's operating correctly and you're getting unknown then it doesn't look like you'll be able to use the module, as it apparently doesn't support the feature, or has an unsupported policy set up.
...roboticus
When your only tool is a hammer, all problems look like your thumb.