Over the weekend, I had a NUC crap out in someone's office. I drove over and swapped it for an identical one and then went back about my day.
Windows 11 was just fine and dandy, actually. No problems with Windows 11.
These people have perpetual Office 2019 licenses on their systems, but they aren't big enough for volume licensing. They only part of the hardware that changed was the MAC address on the NIC and MAYBE the firmware version. The way it's supposed to work now is that you sign in to a Microsoft Account at office.com/setup, then add your product key. OK cool. That was done, license attached, right? It is tied to specific hardware, but since Windows was fine with it, I figured Office would be too.
It was not.
Office decided that 2019 was suddenly unlicensed, then switched itself to Office 365. The individual at that PC had been paying for Office 365 out of her own pocket at some time in the past, probably because her boss didn't want to upgrade from 2013 for years. Her 365 license was also expired and over the usual 15GB quota, so Microsoft wanted money before it would let her use her account again for 365, although the error she got on the desktop just said this copy of Office is unlicensed.
There's a little VBscript you can usually run to make Office reactivate a product key, but the key I KNEW was valid for that User and PC wasn't being accepted because it turns out that Office decided all on its own that the installed product was 365 rather than 2019, somehow. I finally noticed that the version number for Office wasn't what it's supposed to be for any version of 2019, even though Windows said that was the only product she had installed.
I've done Windows deployments to 50 PCs in less time than it took me to figure out how to untie the knot of fuckery involved in all this. The worst offense here is that Microsoft seems to treat Office 365 as the default product for pretty much everyone now. It turned out that her original 2019 license key did work, once I installed from the binary I'd used to install it in the first place instead of the generic Office installer Microsoft puts on the Account page, which appeared to reapply the 365 license on her account rather than the 2019 license that was ALSO on her account.
And this is why I'd rather just do Google Workspace.