Basic Authentication Deprecation in Exchange Online – UPDATE 

NOTE: Microsoft has announced one-time exception for the customers to re-enable protocols till December 31, 2022. Here are couple of links with details:

The Oracle Workflow Notification Mailer uses an IMAP mail server for inbound mail processing and an SMTP mail server for outbound mail processing. You can implement OAuth-2.0–based authentication instead of basic authentication for connections to the Microsoft Office 365 Exchange Online IMAP server. In the current release of Oracle Workflow, the OAuth-2.0–based authentication is available only for IMAP connections to the Microsoft Office 365 Exchange Online IMAP server.

Take a look at this document where it describes how to configure Oracle Workflow for OAuth-2.0–based connections to the Microsoft Office 365 Exchange Online IMAP server:

Configuring Oracle Workflow for OAuth 2.0 in Oracle E-Business Suite Release 12.2 and Release 12.1.3 (Doc ID 2884072.1)

 

Flow of EBS Workflow and OAuth authentications using client credentials