Sending, receiving, and organizing email in Outlook.com
Hi,
There is currently an outage affecting the Microsoft 365 system, which includes Outlook; access is unavailable at this time. There is no estimated time for when services will be restored, but Microsoft is already working to bring them back online.
You can check the status via the link below to see if access has been restored.
https://status.cloud.microsoft/m365/referrer=serviceStatusRedirect
Please consider rating the question and visiting the Microsoft Q&A community if you have further questions.
Thanks.