Coupon code is not working

Please check if the following apply: 

1. Has the code expired? 
2. Confirm the code is for this website. Sometimes in an email there are multiple companies advertising, one company may have a code but it doesn't apply to all websites or the sender. 
3. Coupon sites are not affiliated with our company. They may have coupons on their website but they are not ours. 
4. Is it being entered correctly? make sure there are no spaces