Applications installed as trial; asking for serial number?

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This seems to be similar to other users' problems, but it has not been solved on our system yet:
Our office has 1 seat of Creative Cloud for Teams.
I successfully downloaded and installed Illustrator on my computer.
Then I re-assigned our seat to another person in the office, who already had a trial of Illustrator CS6 installed.
I received the email "...unfortunately you no longer have access..." and the other person received the invitation email.
They accepted the invitation email, opened Illustrator trial, and clicked "License this software".
It logged in with their Adobe ID, but then asks for a serial number (which does not apply to Creative Cloud).
How can we get their software licensed?
We are using Windows 7 Professional 64-bit.
"Hosts" file has no Adobe entries.
Tried downloading and installing Photoshop CS6: same problem. Opens as a Trial, which then cannot be licensed.
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Replay

I just had the user re-accept the invitation, and it seemed to solve the problem.
For whatever reason, the first 2 times she accepted the invitation, it didn't register with the Creative Cloud Admin console.
But now applications seem to be fully licensed, and the admin console shows the user as active.