When creating an Azure Synapse workspace, the primary file system container in the linked ADLS Gen2 is created automatically by the system. However, if this container wasn’t created properly due to a glitch or permissions issue, it may not be visible in Synapse Studio.
Since you mentioned that the workspace was created using the az synapse workspace create
command with an existing ADLS Gen2, it's possible that the creation process did not properly link or create the primary file system container.