MBR2GPT - Disk layout validation failed for disk

[Raz17]

When I installed windows I accidentally didn't put it in UEFI mode and did not notice for a while, I was just having problems booting the drive by default and have been having to manually, now that I have realized it, it is too late to do a fresh windows install so I am trying to use the mbr2gpt tool. my OS is on a 250gb Samsung 970Evo, which is identified as my disk 2, I ran;

mbr2gpt.exe /convert /disk:2 /allowfullos

But even though that is the disk which has my OS I get the error;

Here is my drive layout;

 

How do I get past this error and convert it so I can use UEFI?