Start PE with Valve Index controllers. I had only the right hand controller enabled if it matters.
Now switch to handtracking in the menu.
Now every interaction will trigger a vibration in the controller. 
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Yep, thanks for reminding me, this will be disabled in hand-tracking mode in upcoming versions Theres still a lot to be improved when it comes to the hand tracking feature, but we will get there - its just the beginning!
Thanks
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