Coupon does not exist error

Unfortunately our Black Friday coupon has not been working for customers when trying to checkout. a message saying ‘coupon “Friday15” does not exist’.

Have checked all settings and tried to delete coupon and create a new one but still no luck. A timely response would be much appreciated.

error message: https://imgur.com/S6RwJkN

coupon settings: https://imgur.com/a/H7VbYWY

The page I need help with: [log in to see the link]