Microsoft 365 is currently experiencing an outage affecting users on both coasts of the United States and preventing them from accessing multiple Office 365 services. Starting at approximately 2:30 PM EST today, users all over the U.S. began having difficulty accessing their Outlook mail and using Microsoft Teams, with active calls getting dropped. Customers also reported having issues accessing the Microsoft 365 admin center earlier today. Microsoft says that services are recovering after reverting a change that may be behind the outage. Last week, Office 365 suffered another outage that prevented users from logging into their Microsoft Teams and Office 365 accounts.
Source: https://www.bleepingcomputer.com/news/microsoft/microsoft-365-outage-takes-down-outlook-and-microsoft-teams-again/