Gladly (or maybe not) by the time the 5 years are done my software will probably have moved on to Win11 (or 12), so I'm just on the "regular" LTSC 2021 (21h2). The rest of our college is still on normal release 21h1 Enterprise. From what I've seen, Win11 is going to be an even bigger issue for places like your work, from what I can tell with the limited time I've spent, Win11 is pretty much forcing Microsoft or Azure accounts. Again this may be different for Enterprise and LTSC W11, and I have tons more learning to do. Only just received a computer that is supported back in May and been busy refreshing a classroom and a bunch of non-computer tasks all summer.
If you have time, can you go through the process of getting the IOT licenses? Might help other people down the road. I know I don't see them in our licensing center, I think we are E5 but I don't really handle the licensing part. I just report how many of which products I need, and which keys I'm using and someone else takes care of the money part.