Coupon is expired

I have updated a previous form which contains promo codes, however the issue is that when using the code it is says ' coupon is expired. Please try another one'

How can I resolve this so that it works

To which form is your issue related to? Please provide us a form URL. 

Where to Find My Form URL?

Please provide us the coupon code as well.

I would also suggest you to check if the coupon code has an expiration date. 

How to Add Coupon Code to Payment Forms