Our customer has Azure Communication Services for sending emails and its authentication is based on OAUTH2 and requires authentication via Connection String. More details in Below Link
Quickstart - How to send an email using Azure Communication Service - An Azure Communication Services Quickstart | Microsoft Learn
Oracle analytics server doesn't have features to provide these authentication parameters. It will be good to get this enhancement added to Oracle Analytics Server.
We have open an SR with Oracle support to confirm and they have advised us to open an idea or future enhancement request.
Here is SR related information.
3-33016809271: How to configure email for office365 in OralceAnalytics Server
Please take a look into this request.