Why is my discount code suddenly invalid?

Hi, I have a discount code that appears to have stopped working, despite it being setup to run until 16th December 16:59. It has been working but today it is saying that it is no longer valid with the items. Can anyone shed some light on how I might correct this?

As I say, it has been working and we have had sales through it, but as of today we have customers contacting us to advise that they haven’t been able to use the code. I also can’t make it work when I trial it myself.

It is a buy X get Y for free discount code.

Many thanks in advance for any suggestions

Lydia

the same issue happen with me did you get your answer if yes then please let me know too…