Quick sidebar with the Dell systems: Just a few years ago, using non-OEM media on Dell systems was a painful, non-recommended process. Now, if you reinstall Windows 10 using Microsoft's Media Creation Tool (what we previously would have called the retail version), doing a clean install keeping nothing, it will just pick up the OEM key automatically. A welcome relief.
Edit: I should add one proviso - I can't vouch that this will work with pre-2013 hardware. It may work, but I haven't tested it yet.