The only way to know is to take it in and find out. That scuff shouldn’t be an issue and it probably won’t be but you might get an overzealous genius that thinks it is. From getting express replacements through AC+, via online, what they are looking for is cracked screens and high impact damage to the body that would suggest the device was treated with unusual carelessness.
Express replacements are the best part about AC+. You don’t have to deal with those overzealous genius who can’t reproduce your issue or complain that your battery is at 81% instead of the 80% for replacement. They will give you a new phone and won’t charge you as long as it’s not damaged, even if they can’t reproduce the issue.