Is it possible to configure Oauth based login in AEMaaCS for authors

Hi ​@urvashiagarwal 
 

Yes, OAuth works in AEMaaCS for authors, but you'll configure it differently:

• Keep using Azure AD for user authentication
•  Add Adobe IMS as the OAuth broker
•  Configure federation in Adobe Admin Console
•  Don't try to configure OAuth directly in AEM

The user experience remains the same (SSO with Azure AD), but the technical implementation changes to comply with AEMaaCS architecture.
https://experienceleague.adobe.com/en/docs/experience-manager-cloud-service/content/security/ims-support
https://experienceleague.adobe.com/en/docs/experience-manager-cloud-service/content/security/setting-up-ims-integrations-for-aem-as-a-cloud-service
https://learn.microsoft.com/en-us/entra/identity/saas-apps/adobe-identity-management-tutorial
 

Thanks

Hi ​@urvashiagarwal 
 

AEM as a Cloud Service supports OAuth-based authentication for AEM APIs and integrations, but it does not support direct OAuth/OIDC login to the AEM Author UI.

For the AEM Author service, Adobe documents the supported options as:

• Adobe IMS authentication — the standard author login mechanism.
• SAML 2.0 through Adobe IMS — for federating Adobe IMS with a customer identity provider such as Microsoft Entra ID/Azure AD.

Adobe's authentication matrix explicitly lists OAuth as unsupported for direct AEM Author login, while listing Adobe IMS and SAML 2.0 via Adobe IMS as supported for Author.
Sources:

• AEM as a Cloud Service authentication
• IMS Support for Adobe Experience Manager as a Cloud Service

Adding to the answers above: plan the IMS/SAML federation work as its own workstream, because it needs Admin Console access and the identity team, and it usually takes longer than the code changes. Also check how existing AEM users and groups map to IMS profiles and groups. The Content Transfer Tool moves groups, but author login now comes from IMS.