Hi @abhigyans406402 ,
AEM Cloud Author requires Adobe IMS authentication. So for LDAP login, you need to figure out if you can set up Adobe IMS to integrate with your LDAP. You can refer to this link:-
https://experienceleague.adobe.com/docs/experience-manager-cloud-service/content/security/ims-suppor...
Hope this helps.
Regards,
Nitesh