This issue is resolved.
For those CLEVNET libraries that have Hoopla:
At this time, if you try to download a Hoopla item from the CLEVNET catalog (search.clevnet.org), you will receive an error message, but the item will still successfully download to your Hoopla account. We are aware of the issue and looking into a solution. We will update once this is resolved.
Patrons can view and download their Hoopla materials at: https://www.hoopladigital.com/login