I was able to use a similar promo at Tysons Corner Center outside of DC last month, despite some rather amused looks from the people at the customer service counter.

Some of the promos have fine print that more-or-less makes them useless to US-based cardholders (e.g. Amazon promo only works if shipping from Amazon US to China), but absent such terms, they should work.

Also, FWIW, I've been batting about ~60% at getting this to process over Discover while trying to hit the $1k cashback bonus.