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What type of environment is there ? Is there MS Exchange ? What happened with your Outlook account? What errors are there?
Please provide more details.
Please check this link, https://support.office.com/en-us/article/unblock-my-outlook-com-account-f4ad2701-d166-4d8b-8a6a-9af2a1f8a4c4
However, if it does not help much, more information is needed.