If Hype Reflect is giving you a blank screen (as opposed to staying at one of the loading screen) that probably means it is connecting and trying to send data, but there might be an issue with serving it or the document. If you see the toolbar with the Show in Safari button, does that also show a blank page when viewed in iOS Safari?
I assume you saw this document from your comment, but if not pleas also make sure to try all the steps here:
It sounds silly, but the first thing I'd try is restarting your mac. Sometimes there are intermittent issues in Hype's connection pipeline that get cleared up this way.