Good luck, I've been complaining about something similar to this for weeks but Bungie have said nothing about it.
In my case Howl of the Storm doesn't work if I have sprint set to hold, but changing sprint to toggle fixes it. I hadn't thought about crouch though and setting toggle to crouch to c from ctrl also fixes it, it seems like some key combinations don't work while others do for some reason.
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Ahhh, i didnt know that type of sprint could effect the outcome, in my case my sprint was set to hold too.