After seeing the post from deadfish with the expired Hello Fresh code they got sent I thought I would try some other codes.
Figured if MIGHTYFRESH doesn't work what about MIGHTYHELLO?
Code MIGHTYHELLO takes $10 off your order.
I'm assuming there will be exclusions but not sure what they are.
Have tested this on an account that was brand new and also an old account which last ordered 6 months ago.
No idea of expiry.
I can confirm this one works! (whereas MIGHTYFRESH did not)