Unreal Engine doesn't recognize clang as installed

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Tried installing it to different folders, to different drives, re-downloading it, no matter what I do, it doesn’t see the v20 version. It does see the v19 version if I install that one instead, but obviously Unreal 5.1 doesn’t work with that one.
I got the clang installation exe from Development Requirements documentation article.

Also having this same issue. I am on windows 10, trying to build a linux shipped build but getting an error saying I don’t have the correct SDK installed despite installing the exact one referenced in the doc tools. it does not show up in the tool menu as installed

Having the same issue with 5.4, it sees v21 but not v22.