Hi @naveenanto ,
Maybe you are using wrong endpoint? According to the documentation:
"When automatic identity management is enabled, you can directly search in identity federated workspaces for Microsoft Entra ID users, service principals, and groups, and add them to your workspace."
I think this feature will bring Entra Id group to the workspace. Try to use endpoint from below link, which should list all groups associated with Databricks workspace. The one that you used before was checking for groups associated with account level.
List group details. | Groups API | REST API reference | Azure Databricks