@Zazzoo, Welcome to the HP Support Community!
You have to complete the enrollment to avail the free months. Once the printer is enrolled in Instant Ink, you may login to the Instant Ink account to check if the free months are credited.
If not, do not worry, to assist you better, we would need some information related to your Instant Ink Subscription. This information cannot be shared on a public post.
I have sent you a private message, reply to the message with your details.
In order to access your private messages, click the private message icon on the upper right corner of your HP Community profile, next to your profile Name or simply click on this link.
Hope this helps! Keep me posted.
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Have a great day!
KUMAR0307
I am an HP Employee