Repairing OneDrive “Next-Gen” Sign-in Loop of Doom on Windows 10

So I had a long-running issue where the next-generation OneDrive sync client just wouldn’t sign-in to my corp account, and nothing was syncing. I had tried the nice steps laid out on the support site, plus some more, but to no avail – the icon would stubbornly sit on “OneDrive for Business – Signing in”…

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