When you buy a new printer and set it up either at 123.hp.com or using the HP Smart app, you are offered a free trial of Instant Ink.
The number of free months depends on the offer at the time and the country of enrollment.
You must take advantage of this offer within 7 days. There is no special code and the free months are automatically applied to your account. After 7 days, the free trial offer expires.
As you have not enrolled in the instant ink program within 7 days of the purchase, you cannot avail the free trial on the printer.
Also, refer this article to know more information about enrolling in instant ink services. Click Here
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