You get a 2nd email when they give you the $10, be on the lookout for that. Is your card good btw?
Shouldn't be any issues but the weird thing is on the audible site the membership shows some places as active and some places not. I'm not pressed to spend the $10, I buy stuff on Amazon all the time, hopefully it will come through tonight or tomorrow. They just wanted my post to be truthful, clearly.