Can't sign into Microsoft account – Minecraft says no internet

Been stuck on this for a couple days now. Windows Security keeps telling me it couldn't sign me into my Microsoft account and that there's some kind of problem with my PC.

Minecraft won't let me log in either—says I "do not have an internet connection." Except everything else works fine. Browser, other apps, all online. It's been like this for days, so I doubt it's just a server hiccup.

Running a Ryzen 7 7900X, 32GB DDR5, RX 7800 XT, OS build 26200.8973. Minecraft error is 0x800704cf—tried every fix I could find, nothing worked.

Anyone else seen this?