Thank you for that reply, I do understand but saying it a little differently. You still need another USB key to put your temp ZDT onto and without having another USB to do this you can not get Cubase working. So whether you are waiting on another USB key to arrive for the ZDT code OR waiting for Steinberg support to contact you (while also waiting for another USB key) you still don’t get Zero Downtime you just get downtime. Which is ovbvious.
Of course If you DO have a spare USB Key, then yes the ZDT temp code will save you until support can sort out a proper licence replacement.