Hi @Kris2 , I completely understand your hesitation and appreciate your approach to seeking guidance! 

This error generally means that the cluster has connectivity to Unity Catalog configured storage location and it is not authorized to access storage. It could happen because of the following reasons.

1. Access connector does not have right role or
2. Storage firewall issues or
3. Wrong storage credentials/spark azure keys being used.

You can check the below details to resolve this error: 

• Verify that the storage principal/managed identity used has access to the storage account. It should have the `Storage Blob Data Contributor` role assigned at the storage account level.
  If you can’t provide `Storage Blob Data Contributor` role to SP/MI at the storage account level but only provide at the container level, you can set `Storage Blob Delegator` role at the storage account level and provide `Storage Blob Data Contributor` role at the container level.
  Please refer to https://learn.microsoft.com/en-us/azure/databricks/data-governance/unity-catalog/azure-managed-ident... step for details.
• If the access mechanism is based on storage principal (SP) and there is a storage firewall being used, managed identity (MI) should be used instead of SP. Refer to https://docs.microsoft.com/en-us/azure/databricks/data-governance/unity-catalog/azure-managed-identi... for information on MI.
• If you are using a private link for gen2 storage with public network access disabled, it would be required to enable MI connector for access as mentioned below.
• If you have the exception “Allow Azure services on the trusted services list to access this storage account” allowed ( this is only visible when the Public access option is set to 'Enabled from selected virtual networks and IP addresses') and then set Public option to Disabled, it would work fine. If the exception is not allowed, then adding MI connector as per https://learn.microsoft.com/en-us/azure/databricks/data-governance/unity-catalog/azure-managed-ident... and switching public access to disabled state would work fine.
• If managed Identity is being used, ensure that storage account network rules (if any as per https://learn.microsoft.com/en-us/azure/databricks/data-governance/unity-catalog/azure-managed-ident... ) are added with righ tenant Id and resource Id details if it’s done via CLI/Arm template. You can list the rules using azure cli https://learn.microsoft.com/en-us/cli/azure/storage/account/network-rule?view=azure-cli-latest#az-st...

Leave a like if this helps, followups are appreciated.

Kudos,

Ayushi