New Delhi, April 21 -- Global coffee and doughnut chain Dunkin' has announced a promotional giveaway of up to one million free coffees for its rewards members on April 21. The offer is available through the brand's mobile app and is subject to availability.

According to a report by USA TODAY, customers enrolled in the Dunkin' Rewards programme can access the deal starting 9 a.m. local time by applying the promo code "FREECOFFEE1" within the app.

To claim the free coffee, eligible users must log into the Dunkin' app and enter the specified code after the promotion goes live. The company has stated that customers will have a window of seven days to redeem the offer once it is added to their account.

However, the offer comes with certain ...