Office 365 for mac authentication failed

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This is normally achieved upon installation, however we have noticed that Windows or Office automatic updates can sometimes result in the products being “ Disabled” or requiring “ Activation” The latest versions of Microsoft Office (Office 365 and Office 2016, 2019) all need activating by logging into an Office 365 account. If you still have problems, please bring your computer to our office in Subiaco and we will fix the issues for you for a small fee. Please read the following self-help guide. How to deal with common Microsoft Office issues such as activation and reinstalling.