Licence gone after update. Rhino asserts it's in use on another machine!?

Hi all

Just moved my license to a new computer. After the first online Update Rhino tells my my license is in use on my old computer.

What to do?
Log in to the old computer and remove a license that is already removed?

Activate the license there and the remove it again… until the next update?
Fortunately I haven’t sold the old one yet.

Think you can do better?

The report shows you validated to a machine called M11 on the July 10th.

@Japhy the timing goes with the removal from M11.

How was I able to work on a machine with another name since then?