I have confirmed that the SQL warehouse is running in Pro mode and the firewall is open. When testing access via a notebook, I receive responses using both the IP address and DNS.

I just attempted to configure a foreign catalog using a connection based on an app registration. The connection test was successful. But, when I access the catalog, I only see a list of schemas like 'db_accessadmin', 'db_backupoperator', etc., and no tables are visible.