India, Aug. 26 -- Dunkin' has launched a nationwide promotion offering one million free espresso beverages to mark the return of its autumn menu, the coffee chain announced, giving Dunkin' Rewards members a limited window to redeem a complimentary drink using a single promotional code.

From 12 pm ET, members of the chain's loyalty programme have been able to use the code EASYCHOICE to claim one free espresso beverage from Dunkin's fall lineup, the company said in a statement announcing the offer. With only a million codes available on a first-come, first-served basis, Dunkin' urged customers to redeem theirs quickly once the promotion went live.

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