Issue with Browsing Datastores referencing an Azure Data Lake Storage Gen2

Hi all, 

I am having issues with the capabilities to browse a datastore referencing an Azure Data Lake Storage Gen2 in the Azure Machine Learning UI. 

Here is the scenario:

- Create a Datastore referencing an Azure Data Lake Storage Gen2 with "Allowed workspace managed identity access". No service principal credentials added yet.

- After creating the Datastore, I can browse the Datastore for contents (files and folders) without any problem.

- Update Authentication: Add a Service Principal Authentication Type. 

- After update, I am not able to browse the Datastore anymore.

- The Service Principal used for Authentication and Workspace Managed Identity have the following RBAC on the referenced Azure Data Lake Storage Gen2: Reader and Data Access and Storage Blob Data Contributor. The RBACs are set at the Resource Group level which contains Azure Data Lake Storage Gen2.

- For Testing, I have also created a Datastore referencing an AzureBlobStorage created in the same resource group as the Azure Data Lake Storage Gen2 and setup AccountKey access. I have no problem browsing the Datastore in the UI.

What is causing this problem? 

I appreciate your help!

Francois