In order to continue to use Basic Authentication in Office 365 after October 2022 (when most of basic authentication is being disabled), you have to enable SMTP AUTH in the mailbox. There are a couple easy steps of how to do this.
- Log into Admin Center
- Enable Organization Authentication
- Enable Mailbox Authentication
1. Log into Admin Center
If you’re in office.com, select “Admin” on the left hand side.
2. Enable Organization Authentication
On the left hand side, select Settings -> Org Settings
Select “Modern authentication”
Ensure that you have IMAP4 and Authenticated SMTP enabled.
3. Enable Mailbox Authentication
Proceed to Azure Active Directory. From there, select Users -> Active Users, and select the outgoing email account for the scanner service.
Select the Mail tab, and Email apps -> Manage email apps. Ensure that your protocol of choice is selected, and that Authenticated SMTP is as well.
Refrences
§1 https://docs.microsoft.com/en-us/exchange/clients-and-mobile-in-exchange-online/authenticated-client-smtp-submission