Windows 11 Pro won't activate? "Error communicating with our activation servers. 0x803F700F"

[Microsoft Windows]

Suddenly the "Activate Windows" watermark popped up with the 0x803F700F error (also after restart).Nothing's changed apart from updating to 24H2 a couple days ago (which I regret every day a bit more).The help/troubleshoot app is less than helpful, it's slow af and when I get to the point to contact someone it simply hangs itslef when I try to sign in.This user experience is unacceptable, why does my Windows have to telephone home constantly anyway, this is ridiculous.

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