"The account isn't associated with this Office product" message when I try to sign in to my account
If you bought and installed Office, but your My Account page doesn’t list it, you’re probably signed in to an account that’s not associated with your Office subscription.
Sign out and then sign in again with the email address you used when you installed Office. To sign out, click your name at the top of the page, and then click Sign out.
If you don’t remember which email address you used when you installed Office, contact Support.
If you bought Office with a new PC, you might need to download and install Office.
Go to http://office.microsoft.com/getoffice, and click Download now.