What is the error message that you are receiving when you try and activate the license code on the second machine?
Some helpful thoughts in the meantime…
Try activating by using the
RegUtil.exe found in the UiPath installation folder.
regutil.exe activate /email@example.com /code=999999999999
The following will display the status of the license on the machine, maybe run it on the old and new host and see what it is
If the License code wasn’t deactivated correctly and you still have access to the original host, you can also deactivate it yourself.
If your using an offline host, you can also use the
regutil.exe get-deactivation-cert and http://support.uipath.com/deactivation more information can be found in the regutil documentation.