Win 11 Pro vs Pro Workstation? also used PC license xfer issues..

Trying to see who else might understand this before I make a mistake or do something I regret... please note i'm a win 11 idiot cuz I was still fighting to make win 10 still work not that long ago.

I just bought an HP Z4 G4 (a workstation with xeon cpu) from a computer recycler and it came with a Windows 11 install on it which wasn't set up yet. So I went thru the setup screens for choose country region, keyboard, the user agreement thing, then asks to link your microsoft account - which I did - then I check my microsoft account login side and it recognizes that I now have a windows 11 PC license as a part of it. On the desktop, screwing around, seems to work fine so far.

Then I check System Information and there's a red dot saying "not activated", even tho in the microsoft account logged in from a different PC it says the win 11 PC showing up as a registered device with a serial # and such. So I use some troubleshooter on the Z4 and it says there's a license difference and the PC needs windows 11 Pro Workstation.

I bought the machine in good faith assuming i'd have a working windows 11 on it and got a good enough deal I wasn't planning to return it, i'm just wondering if this is sounding like it's not going to work as advertised. I'm not even sure how "selling a used machine with windows" technically would work with recyclers anyways (and i'm pretty sure this originally HAD win 11/not put on by the recycler cuz most of their machines are linux reinstalls unless someone donates a machine with an existing install which they wipe data and resell/reset somehow), but even if maybe it works for normal win 11 maybe it doesn't work for machines requiring a workstation license.

Or maybe 'used windows 11' is a thing you can never take over ownership of ultimately anyways and in 30 days or something i'll get a gripe from microsoft disabling the PC unless I buy it 'again' despite thinking I had it. :- P


Now I was reading online somewhere that maybe I can just take the key that was registered to the PC hardware could be reinputted in some 'change windows license key' form and that that might fix it. But that raised all the questions of "can I even do this?" with a used PC, and will the "it was reinstalled with 11 pro not 11 workstation" turn into an issue?