Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
Your Q was answered in your other post.
The card/PIN supplied by Argos cannot be used to reinstall Office, you need the Office 25 character Key and will then have to use phone activation and wait to speak to a real person.
Or log in to your MS account via the MS Store link
One of the downsides of purchasing a KeyCard version