[IPeeMyPants]

For those who do not know, Overwatch has been added to wingman therefore you cannot hvh. 
If you want proof,

DO NOT PLAY WINGMAN HVH.

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For those who cannot open the link to the CS:GO updates, here is what the update included:

DO NOT PLAY WINGMAN HVH.

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2018.03.07 - 
[ WINGMAN ]
– Overwatch will now also cover Wingman matches.
[ MISC ]
– 

DO NOT PLAY WINGMAN HVH.

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 now supports passing information about all grenades and inferno flames in the map to external systems by setting “allgrenades” “1” game state integration config setting.

Enjoy. R.I.P wingman & my acc I spun on last night.