Hi,

Could you please reverify if you have followed the main steps i.e. (https://learn.microsoft.com/en-us/azure/databricks/administration-guide/cloud-configurations/azure/v...)

• Connect Azure Databricks to other Azure services (such as Azure Storage) in a more secure manner using service endpoints or private endpoints.
• Connect to on-premises data sources for use with Azure Databricks, taking advantage of user-defined routes.
• Connect Azure Databricks to a network virtual appliance to inspect all outbound traffic and take actions according to allow and deny rules, by using user-defined routes.
• Configure Azure Databricks to use custom DNS.
• Configure network security group (NSG) rules to specify egress traffic restrictions.
• Deploy Azure Databricks clusters in your existing VNet.

Also, the UDR related steps, https://learn.microsoft.com/en-us/azure/databricks/administration-guide/cloud-configurations/azure/u...

Also, mainly, for metastore, artifact blob storages and etc you have to allow the below DNS list as per the region: https://learn.microsoft.com/en-us/azure/databricks/resources/supported-regions#--metastore-artifact-...

Please let us know if this helps.