7. Once your product has been activated, you’re done! You can click “Start Using” to begin using the app you have opened.
Note: Once you have activated Office for Mac, you can add your Office apps to your dock for easy access and startup.
Problems you may encounter during activation
How do I activate with multiple licenses?
For Microsoft 365 for Mac, you can have up to 25 licenses associated with the same Microsoft account: only one license for a Microsoft 365 subscription and multiple one-time-use installs of Microsoft 365 for Mac Home and Student or Home and Business.
If you have multiple Mac licenses associated with the same Microsoft account, it's best to start with a Microsoft 365 subscription because you can install it on all your devices and be signed in to Office on five devices at a time. A one-time-use license can not be deactivated. If you don’t have a Microsoft 365 subscription, start by using the license at the top of the list and moving your way down.
There isn't a way to track your one-time licenses so we recommend you keep a list as to which license is activated on which device. If you don’t remember which license was used, you'll have to go through a process of elimination to determine which ones you've used so far.
Choose the license you want to use. (We highly recommend choosing a Microsoft 365 license if you have one.)
After the license validates, it will activate the product, and you can click Start Using Word to open and start using Microsoft 365 for Mac.
Multiple licenses and keys already used error?
If you try to activate a one-time install of Microsoft 365 for Mac and you get the error: Key already used, you will need to select another license to use. Click Cancel and you'll return to the license selection screen.
The license that you tried to use will be grayed out. You can select any other license that hasn't been used.
Where do I enter my product key?
If you haven't redeemed your product key for Microsoft 365 for Mac, you'll want to do that before trying to activate it. Follow these steps:
Step 2: Sign in with your Microsoft account, or create one if you don't have one (you can create one with any existing email address you already have). Be sure to remember this account so that you can install or reinstall Office later, without a product key.
Step 3: Enter your Office product key, without hyphens.
Step 4: Follow the prompts to finish the redemption process.
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