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How to Fix Microsoft 365 Activation Failed: A Complete Troubleshooting Guide
Seeing the “Microsoft 365 Activation Failed” message can be frustrating, especially when you need to open Word, Excel, PowerPoint, or Outlook and get work done. In many cases, the problem is not as serious as it looks. Activation can fail because of an incorrect Microsoft account, an expired subscription, an internet connection problem, conflicting Office installations, outdated Office apps, or an issue with the device’s date and time settings.
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My issue was with my iMac, and that has been noted by Microsoft. However, I am tenacious and beat the problem. First, delete the entire Microsoft 365 application. I used CleanMyMac. Next go to the library/applications support/ Microsoft. Just delete the entire Microsoft folder. Conduct a clean install and then open one of the applications and signin. Voila!
