Microsoft has announced that:
IMPORTANT: Sometime in second and third quarters of 2022 we will selectively pick tenants and disable Basic Auth for all affected protocols except SMTP AUTH for a period of 12-48 hours. After this time, Basic Auth for these protocols will be re-enabled, if the tenant admin has not already re-enabled them using our self-service tools.
If Microsoft disables Basic Auth on your tenant then EzeScan will display the following error message:
In order to resolve this issue your EzeScan job must be reconfigure to use our new Microsoft Office365 Outlook connector.
It is recommended to use version 5.x of EzeScan when using the Microsoft Office365 Outlook connector.
For the configuration of the connector please see Microsoft Office 365 Outlook