Controller Vibration is somewhat bugged.

[Urkikk]

If the game is run before controller connected, the vibration will not work, and cannot be re-enabled.
If the controller disconnect from device by any mean in game, when put it back, the vibration will also stop working, and cannot be re-enabled.

Messing with vibration setting will not solve the problem, and the only solution is to restart the game with controller connected, or just accept it with controller vibration disabled.

[Brokensword]

Wow what a dumpster fire of a PC port.
So glad I passed on this. Sticking to MHW, this one needs another year at least to cook.