Microsoft Hyper-V VLAN support doesn't work...
... and basically never has. Mind you, it always "works" somehow but it's always a clusterfuck.
To say I'm done with Microsoft software on this level is an understatement. It's beyond "they can't get it right." I can cope with "weird." I can't cope with "works for a while AND THEN JUST FUCKING DECIDES NOT TO."
Fuck Microsoft.