@Prerna Munjal​ Can you share the Data explorer UI or show the results SHOW CATALOGS command?. Have you set up the UC metastore first in the Databricks account console if not follow the below document and set up the metastore first. If it's already created, can you test it using shared access mode?

https://docs.databricks.com/data-governance/unity-catalog/create-metastore.html