Promo code region locked?

I’ve seen a bunch of promo codes floating around lately and I’m tempted to give a couple a shot, but I’ve heard stories about people running into issues because of region locks. Not sure if this depends on where you make your account, the address on your ID, or just your actual physical location at the time you use the code. Anyone actually get burned trying to use a code that wasn’t valid in their area? If so, what ended up happening with your bonus funds?