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Having trouble logging in to Office 365? You aren’t alone.
The official @Office365Status account on Twitter says:
We're investigating an issue in which users may be unable to sign-in to Office 365 and are receiving an error related to Office 365 subscription activation. More details can be found in the admin portal under MO146611.
— Office 365 Status (@Office365Status) August 16, 2018
There are several possible suspects listed in the linked thread. It seems that locally installed versions of Office 365 (as opposed to the web version) are causing problems. Possible that it’s associated with Modern Authentication. One user reports that he removed activation from his keychain and it worked.
