If you're using a volume license version of Office Professional Plus at work, you'll need to contact your admin for a product key. To locate your product key online, see Get your Workplace Discount Program product key. If you bought Office Professional Plus, Visio Professional, or Project Professional through your employer's Microsoft Workplace Discount Program benefit, you'll need your product key to install Office on a PC.
You can also enter the product key at There are a few exceptions where you'll need to do something other than sign in. Note: If you bought a new, unused Microsoft 365 product key card to renew an Microsoft 365 subscription or to buy your trial, you can enter that product key if Office prompts you for it.
