Bob - I think you’ve been hit with the issue outlined here
there is a bug in the latest version of the Steinberg Application Manager - this means that it can’t see the the licenses that are available on the dongle.
As a workaround until (or if?) steinberg fix it you need to ENABLE the cubase 12 activation in the Steinberg Application Manager. You DO NOT need to install cubase 12 just enable the licence.