One of the members of my guild was told - by the manager at JoAnn's - that all the guild members could get the 10% off card. She even gave one to that guild member. In order for all guild members to get the card, she said that the membership chair (me) had to send a list of the members to corporate and they would then send out the cards. So... I talked to several assistant managers and a manager at the same JoAnn's my friend went to. They know nothing - said talk to corporate. After several emails (all unanswered) and phone calls to corporate (they said I needed to talk to someone who never called back) I have given up. I shop a lot less at JoAnn's than I used to.
I always give them the appropriate coupon just as they ring something up, and tell them I want it applied to that item. That seems to work. Also, if you have an email coupon and a coupon from the mailed flyer and one of the coupons from the flyer in the store - you can use all of them (on different items) at the same visit.