Why is 'Windows boot manager' the only option I have under UEFI boot in BIOS?

[GodCalledInSickToday]

I converted my drive to gpt, it created the 100mb partition etc. I've run command prompts to make sure boot is in there. But when in bios, I went to change legacy to uefi in boot sequence, but the only option under uefi was windows boot manager. If I set it to that then it just results in boot loops of diognostics and failed repairs. Anybody have any ideas?

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