The administrator who is running the network license may get a message that something on the hardware has changed, and that he needs to request another license key. Often, it is important to delete the old key first.
When the admin tries to hit the Delete button on the license manager, it may give an error that “Could not delete registry key”. Have the network admin Right Mouse Click and “run as administrator” when selecting the tm license manager. Otherwise the license doesn't get created under the machine account - it will get created under the admin user's account. It will probably delete if it's started as admin too.