Sending, receiving, and organizing email in Outlook.com
Hello
As of now, the outage for Outlook is not completely cleared yet.
This is the most recent update from Msft: User impact: Users may be unable to access or perform several actions in Microsoft 365 services. Current status: Our recovery efforts to restore service health throughout the affected environment is ongoing and may take additional time to resolve. In parallel, we're continuing to pursue multiple workstreams to pinpoint the source of the issue. This issue impacts Outlook.com, OneDrive, OneNote, Microsoft To Do, Teams, and Microsoft 365 for the web although you may also see issues in other Microsoft 365 services.
So, I am afraid it is not possible to troubleshoot this issue until the outage is completely cleared, so we can know if yours issue is isolated.