You need to provide us more details. The Databricks JDBC driver support following authentication types. Which one do you use?

I think you have misconfigured something. For example, you're using AuthMech=3, but no authentication types from below documentation are using that type of AuthMech (they use AuthMech=11). 
Here's an example of jdbc url from documentation  for OAuth 2.0 authentication type:

jdbc:databricks://<server-hostname>:443;httpPath=<http-path>;AuthMech=11;Auth_Flow=0;Auth_AccessToken=<oauth-token>

Authentication settings for the Databricks JDBC Driver - Azure Databricks | Microsoft Learn