@Tzee Chen , This fixed the issue for me:
- Check if Workspace System Assigned Managed identity has Storage Blob Data Contributor access on the Storage Account. --> This was ok in my case
- Create a server-scoped credential on the master database for the storage account and container
--On master database
CREATE CREDENTIAL [https://storageaccount.dfs.core.windows.net/container]
WITH IDENTITY='Managed Identity'
--> After creating the server-scoped credential the partitioned tables started working.