Originally Posted by
Firewind
I got, in red, that I'd already used that number, and was blocked. The number at issue was my M+ number, not the credit card one. If this were true, it was years ago, because I can't ever remember attaching either card to "Mileage Plus" Dining. So one of the reasons for putting "circled back" in quotes in the title is that I didn't even know that I was.
I bolded that sentence because I don't understand exactly what happened to you - what's the difference between your "M+ number" and "the credit card one"?