I just noticed this thread reappeared today. Just so you know, I’ve been successful in using CAD through Datasmith for the past few weeks, until just earlier today when it gave me the error while attempting to verify the access… I would wager that, as this thread has been updated after a couple weeks of inactivity, that there may be something wrong with the service at the moment. (My thread is located here: Unreal Studio - Entitlement Check fails when attempting to Import CAD file - Pipeline & Plugins - Epic Developer Community Forums, and was opened a couple of hours prior to the last post in this thread.)