They definitely did at one point, I still have a LTSC key from before my school decided to be too lazy to renew Azure Dev Tools for Teaching (Imagine). IIRC the

They definitely did at one point, I still have a LTSC key from before my school decided to be too lazy to renew Azure Dev Tools for Teaching (Imagine). IIRC the keys were per edition, so a 2016 key wouldn't apply to the newest LTSC release.