Activate Office for Mac - support.microsoft.com
support.microsoft.com › en-us › officeOn the Sign in to activate Office screen, select Sign in. Enter the email address associated with Office for Mac and click Next. Note: This may be the email you used for your Microsoft account or the Microsoft 365 for business account assigned to you by your work or school. Enter the password associated with the email address you entered, and ...
office 2019 for Mac activation problem
social.technet.microsoft.com › Forums › officeFeb 28, 2019 · Currently, I notice you mentioned that "the product key has already been used" when you activate Office on Mac. Are you installed Office on another computer before? If you bought a one-time purchase of Office for Mac, you're allowed only one install of Office for Mac and you can't deactivate it in the same way you may do an Office 365 license.