I have been struggeling with this almost an entire day.
Turns out that you can't have your Hyper-V server using a 2003 domain controller as logonserver
(the domain functional level can be 2003, but when your Hyper-V server is logging on to a 2003 DC, you get the same error as if you haden't configured KCD at all)
If you don't stand for something. You will fall for anything.
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