India, April 21 -- Dunkin', the coffee and doughnut chain, is providing complimentary coffee to its rewards members on Tuesday, April 21.

Dunkin' Rewards members may use the promo code "FREECOFFEE1" within their Dunkin' app starting at 9 a.m. local time on April 21 to take advantage of this offer, while supplies last.

The chain informed USA TODAY that consumers have a week following the receipt of the offer to redeem it. Cold brew and extra-large hot coffees are excluded from this promotion, and there is a restriction of one per customer.

The company hinted at the upcoming promotion through a mysterious post on Instagram dated Friday, April 17. This post included a screenshot of the Notes app displaying the message, "just a girl and he...