Basic Authentication Deprecation in Exchange Online – September 2022 Update

I have a lesson to share.  iPhones were the area of concern. Expect Apple users to need to potentially re-enter their passwords. Go to your iPhone Settings, scroll down to Mail.  Click on Accounts then on Exchange.  If it asks for your password, reenter your Microsoft Exchange password and authenticate it with the MS Authenticator App or by having it send you a text.  

Prior to the change, if you see a lot of "exchange activesync" in Sign-in logs with status == success and filtering on client app == { legacy options collection} it may be users need to remove account/add back for their apple mail accounts, or worst case, re-enter password after the switcheroo.

To the Exchange Team, I know this change has been a long time coming and as someone who is responsible for cybersec, "Thank you!"