What should I do if my promotional code doesn't work at checkout?
Verify that you entered the code FREEINK correctly at checkout and ensure you are completing your sign-up within 7 days of purchasing an enrollment card or adding the printer to your HP Connected account. The code is limited to one-time use per printer.
From the official HP Officejet Pro 6830 E All-in-One Printer manual, page 2
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