There was a issue reported as MO123872. It has been resolved as of: Tuesday, 10/24/2017 6:26:44 PM UTC. The user experience of this incident is: Users may be intermittently unable to sign in to portal.office.com. To get more info about this
issue, global admin can check it's history from this page.
If you are still experiencing the issue, please follow the steps below to clear your browser's cache:
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