May 16 2022
We have been using LTSC 1809 successfully for some years, and in the process of upgrading the images I downloaded the 21H2 version.
My issue is, the License key we have been using in 1089 does not seem to be working. do we need another key, or am I doing something wrong?
May 22 2022
To answer my own question;
Yes, a different license key is required to activate LTSC 21H2.