If you purchased Office 365 Business Premium from a Microsoft retail store, this article helps you activate your subscription.
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Volume licensing customer? If you bought Office 365 for business through a Microsoft Open program, see the article, Enter your product key purchased from Microsoft Open.
Activate or renew your Office 365 Business Premium subscription
To renew or add a user license to your subscription with a product key, you need a new and unused key for the same Office 365 plan. Entering your original Office 365 product key won’t work because a key that has already been redeemed can’t be used again.
Go to https://office.com/setupkey.
Enter your product key, then choose Next.
At the bottom of the Tell us about yourself section, choose Sign in.
If you’re not already signed in as a global or billing admin, enter your username and password for Office 365.
In the Choose an option section, choose either Extend end date or Add another user, then choose Finish.
If you’re new to Office 365 for business, learn how to set up Office 365.
Still having trouble with Office 365 Business Premium product keys?
Check out this list of common errors and solutions: Problems with your Office 365 for business product key?