Have wasted a lot of time today by not being able to import with Datasmith. Yesterday it was absolutely fine. My Unreal Studio Status is Active.
For some reason some components were switched off in my firewall settings which I have now enabled but no luck.
Have reinstalled the studio, and exporter plugin - rebooted many times but still wont work.
Any thoughts?
Politely? Read the three top threads on the matter in this section, or the Epic Issue update posted minutes ago? 
Links from yesterday include:
https://forums.unrealengine.com/unreal-engine/unreal-studio/1534682-unreal-studio-entitlement-check-fails-when-attempting-to-import-cad-file
''Something went wrong. We were unable to verify your access ...'' Help, pls - Pipeline & Plugins - Epic Developer Community Forums and
Unreal Studio - Stuck on Entitlement Check - Pipeline & Plugins - Epic Developer Community Forums
Link from today:
Thanks for the update!