Did you solve this already..i ran into the same problem .... :-(
I don't know exactly how Adobe ADEPT DRM stores activation information and associates it with a machine, but it looks as if it does it in such a way that you can't replicate machines in this way. Perfectly reasonable given its purpose (gosh, I never though I would say anything positive about it).
For each machine you will need to deactivate (using crtl-shift-D to Digital Editions), then restart Digital Editions, then reactivate (Library menu. 'Authorize Computer' if it doesn't ask automatically, and give AdobeID and password.).
You will only be able to activate a maximum of 6 machines (real or virtual or eReader devices/tablets) on any one Adobe ID.
I made a virualized Adobe Digital Editions (using Cameyo).
When I try to use it on a computer with Windows 10 pro v 1803 but without admin rights, I am not able to authorise it. (It blocks.)