Stripe – Discount (Error: The subscription plan in Stripe could not be created)

Hi, listers are reporting they can’t use a discount code.
We are using stripe as our card handler, and we’ve had a couple of payments for full price going through but when they apply the discount code they get “Error: The subscription plan in Stripe could not be created, please try again.”
I’ve tried it myself, creating a new test listing and applying the discount code to the package. Sure enough, after the stripe pop up , the screen returns to checkout with the error “Error: The subscription plan in Stripe could not be created, please try again.”