Keyboard keys all functional, and two-key shortcuts work (i.e. ctrl+c) but no three-key shortcuts (i.e. ctrl+alt+delete) are working.

[BBKR]

Things I've done:Checked the keys themselves: they work fine solo or in tandem, it's only the three-key shortcuts that don't work.Checked the onscreen keyboard: three-key shortcuts work when input there, it's only the physical keyboard where they've stopped.Updated Windows 10 fully, ran the update troubleshooter + general troubleshooterUninstalled and reinstalled the keyboard driversRestarted/refreshed the Human Interface DeviceRe-enabled and unconfigured the Windows Key hotkeysEDIT: re-downloaded and re-installed the HP hotkey driverThe only advice the customer support gave me was wipe and cl

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