I fully understand why I can’t reuse the same license key… Is there a way that I can reset my license so I can use it on my production server? I can completely destroy and recreate the test server if needed.
The license is meant to be used on a single server only. However, if you use the same license on another, a test server for instance, but later destroy it, there would be no problem at all. The warning message that you see about the license being used on multiple servers will go away automatically in this case.
In addition to what Ilia said, it’ll take a day or two for our license server to recognize that the old system is gone, but it won’t prevent you from doing anything with the new system; you can install and start adding domains or restoring backups or whatever. It just warns you (the admin user) that there’s another server also using the license. It’ll clear on its own, and can be ignored.