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Send serial number to customer service.Some customer service will say that only new purchases are qualified, then contact other customer service.I bought it at best buy 2 years ago and it can also be redeemed.
shipping is free.
Good Luck.

Free Dyson Gentle air attachment (Iron)
https://www.dyson.com/support/jou…/969749-01

Free Dyson Wide tooth comb attachment (Iron)
https://www.dyson.com/support/jou…/969748-01