Ah, sorry - got it mixed up (deploy and jettison)
But nontheless I just tried to deploy the chute in 2.0.3 and it worked with the assigned shortcut.
I´ve assigned the shortcuts in DCS itself and not in my HOTAS software (not sure if this might be part of your problem)
And have you already tried to bind another shortcut? (I´m sure you have but asking nontheless)