How do I use a Starbucks "Service Recovery Coupon"?

[timbergag]

Someone here has to work at Starbucks, right?

I have a $4 "recovery coupon" because at one point, a barista charged me for my birthday drink, and it was too late to change that. She apologized and gave me the "Your next one's on us - $4 off your next visit" card.

It looks like this: https://starbucksmelody.com/2014/10/25/4-dollars-off-csr/

How do I actually make use of this coupon?

Updates

+1 y

Hmm. So I just try it again?

[Anonymous]

Uh i dont know maybe hand it to the cashier next time you make a purchase at starbucks...

[timbergag]

I did. She said "the card isn't activated."

[Opinion Owner]

Sounds like one of your cashiers made a mistake then.

[timbergag]

Hmm. So I just try it again?

[Opinion Owner]

Couldnt hurt...