You might see this error when you try to activate Office for Mac:
The system requires that you sign on to a valid account. The error code is: 0xD000000C
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Troubleshoot error code 0xD000000C on Office for Mac
Make sure the internet is working on the Mac you're trying to install on. You can do this by opening your internet browser and going to www.microsoft.com. If the page loads, your internet connection is working.
Quit out of all Office apps.
Download and run the License removal tool to remove all the Office keychain entries.
Start any Office app again and follow the activation prompts.
Microsoft Office For Mac
Microsoft Activation Wizard
Are you using a network account?
If you've signed in to your Mac using a Network account such as Open directory accounts, this error may occur because Office for Mac can't write your credentials into the keychain as it is 'read-only.'
If you are signed in with a network account, sign out and sign back in with your local user account. Try activation again.
If you don't have a local user account, you must create one:
From the Apple menu, select System Preferences > Users & Groups.
Select Click the lock to make changes, and type your password. Select Unlock.
Select +, and then fill in the new account information, and then select Create User.
Log into your local user account and activate again.
Contact support
If you're still having issues with activating Office for Mac, please contact Microsoft support.