Could you tell us if some failure is occurring in BlueJeans?
BlueJeans App freezes when it displays [Select your audio option] and [Your Preview].
Also, it takes a long time to join a meeting even if they can click [Join Meeting] on [Your Preview].
*They tried to join a meeting from [Join Meeting] on a meeting invitation email.
Re-install BlueJeans App -> No effect
Join from Google Chrome -> Successful
Join from iPad -> Successful
Join from VC system -> Successful