Exchange Online was updated to enable Modern Authentication (OAUTH2). The Office 365 client has picked up the configuration and is using OAUTH2. Please report any email authentication issues to the service desk.
Impact: change to authentication protocol.
Affected Applications: Email clients for Office 365.
Email sent from Office 365 and destined to on-premise Exchange mailboxes is currently being delayed.
Affected Applications: O365, Exchange
We're investigating reports that users are unable to sign in to Microsoft 365 services using Multi-Factor Authentication. Admins, please see MO165510 on the Service Health Dashboard for more information. https://azure.microsoft.com/en-us/status/
Impact: Local impacts include MUNet users who have MFA enabled (all IT employees and a few dozen early-adopters) and who are either a) authenticating to a device for the first time; or b) have not selected the ‘don’t prompt me for 30 days on this device’ option’ or c) are at their 30-day MFA refresh cycle for their device. https://azure.microsoft.com/en-us/status/
Affected Applications: Office 365 applications and services which are MFA-enabled.