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What I learned from 3 years of running Windows 11 on “unsupported” PCs
(arstechnica.com)
This is a most excellent place for technology news and articles.
It's some kind of locked-down version of GlobalProtect that's integrated with a TPM module to prevent machines that aren't running our corporate image on corporate-approved laptops from being able to connect.
There's probably some kind of workaround, but I'm lazy and it's easier just to power up the Windows machine now and then.