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Windows 10->11 requires MBT be converted to UEFI GBT
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windows11-mbr-to-gpt.md

Windows 11 requires disks use GPT.

A windows 10 to 11 upgrade will not be allowed to begin until this is solved. You can convert MBR to GPT using mbr2gpt built right into windows

Get to to the directory with mbrgpt.exe in cd C:\Windows\system32\

First we will validate the boot volume. i.e. the C drive mbr2gpt /validate /allowFullOS if validation looked successful then move on to the conversion mbr2gpt /convert /allowFullOS

You can also do other disk drives by specifying the disk number (they start at 0) mbr2gpt /convert /disk:1 /allowfullos

Don't forget you may also need to change settings in the motherboard bios to boot from UEFI and secure boot.

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