Thanks for your help.
I'm struggling to create the Storage Credential. I have created a managed identity via an Azure Databricks Access Connector and am making an API call based on what I'm reading in the API docs: Create a storage credential | Storage Credentials API | REST API reference | Azure Databricks
The error response is just "INTERAL_ERROR" with no further description. I suspect there's some adjustment I need to make to my request to cover the fact that this is an AWS workspace, but I'm not seeing it documented anywhere.