The flashing green base light is an indication that it can’t properly connect to the VM infrastructure. Two possibilities here, a) it hasn’t been activated against your account - but you say this has been addressed and b) there is a physical connection problem.
So is this a new setup or an upgrade from one hub to a ‘better’ one?
If the latter, then it is quite possible that the cable is not properly connected and you will need a ‘manned’ installation, ie an engineer visit, to sort this out.