In September 2021, Microsoft announced that effective October 1, 2022, they will begin disabling Basic authentication for Outlook, EWS, RPS, POP, IMAP, and EAS protocols in Exchange Online. SMTP Auth will also be disabled if it is not being used. This will impact users accessing Office 365 on devices that have not been configured using the Modern Authentication setup.

The most commonly reported symptom is continued password prompts on devices – even when entering a known working password mail apps/clients no longer connect successfully.

Update 26/10/2022 – we are seeing a number of Apple iOS users reporting access issues with Office 365/Exchange Online when using the built in Apple iOS mail app. To troubleshoot this issue we recommend users follow the below steps from their iOS device:

Go to Settings > General, then tap Software Update

Install any pending updates and check to see if the issue persists.

If you continue to face the issue the next step would be remove your email account from the phone and re-add it.

Go to Settings > Mail > Accounts.

Tap the email account you want to remove, and choose Delete Account.

Re-add your account – to do this and then please follow the steps on the Microsoft guide here.

See the full Microsoft article regarding this change here.