I have tested basic connection to our internal databricks, and am able to successfully browse folders/files with the list files/folders nodes.
Please try installing the new Databricks File System Connector node, and the List Files/Folders node and attempt to connect again.
I am also seeing a 401 error in your messages which would indicate that the login is incorrect. Can you attempt to login to your admin portal for the community databricks environment and confirm your login is correct?