Office 365: Prevent Basic Auth being disabled
Microsoft will be randomly disabling Basic Auth for some tenants before October 1st 2002, then after October 1 2022, they will disable Basic Auth for IMAP and POP3 regardless of their usage.
For some time it was possible to re-enable Basic Auth for IMAP and POP3 for your tenant –
– it is no longer possible to do that anymore.
You can find more details here:
Switch to OAuth 2.0
You should switch to OAuth 2.0 for authentication purposes:
Daemons/Services: Password grant (MFA/2FA must be turned off for this account):
Daemons/Services: Client credential flow:
Web apps (requires user interaction):
Standalone devices (requires very little interaction):
Desktop apps (requires user interaction):
Below steps are deprecated
If you want to opt-out, read the article below:
…or you can go directly to the self-help diagnostic (use your tenant’s Global Admin account):
It’ll bring up the diagnostic in the Microsoft 365 admin center (if you’re a tenant Global Admin).
Hit Run Tests:
….on the next screen you’ll be able to enable Basic Auth for IMAP or POP3:
For accounts that use shared infrastructure you’ll need to run those 2 powershell commands: