Definitely Windows 11 Pro then. What happens when you open Windows Update and search for updates?
Do you see any updates offered at all or is Windows Update not working?
These updates should be offered to you via Windows Update, so I'd suggest running the Windows update troubleshooter.
If you do want to force update 21H2 via a Windows 11 ISO then get the ISO from
Download Windows 11 (the Windows 11 version there is 23H2). I suspect your problem earlier was that you were using the ISO for Windows Server, not for Windows 11 Pro.
Unfortunately I will be offline for the next couple of weeks