The real issue here is why Microsoft was stupid enough to put out a compatibility tool that doesn't actually indicate why your PC fails the test
they have updated the tool but it can still get it wrong, reporting pc as not having secure boot on when it is.
It at least tells you why now... it might be wrong but it at least says why.
it was done the typical MS way, no clear instructions of what might fail you, no information saying you need to be using GPT to upgrade to it...
I don't have any proof but it feels to me WIn 11 can't install on MBR drives, as you have to have secure boot enabled and it is mutually exclusive to CSM in some motherboard bios, you can't do one and have the other. So if that is true, it explains why people on MBR are being failed.
MS just need to hire some humans to write their instructions for everyone else.
Win 10 introduced the need to install win 10 on GPT if PC was capable of it
Win 11 seems to be enforcing it and removing ability to run MBR and what they classify as non safe platforms.
Rude awakening... not all versions of windows are/were as easy to upgrade to as win 10 was. every 2nd version of win 10 adds new barriers and they are called bad, until people get the next version which has the same barriers but 5 years later, maybe the PC being used is better than the one you had 5 years before.
anyone on 10 who updated from win 7 and who hasn't clean installed probably should just to get all the features of win 10 now.