Hello,
I'm on Windows. I have downloaded the driver, set-up the DSN for Databricks and tested it - all works fine. I have used this DSN to connect to Databricks from ArcGIS.
In QGIS, I followed your instructions and when I click test connections, I get an error - Connection failed- check settings and try again. Extended error information: Unable to initialize ODBC connection to DSN for <username>/<password>@<DSN>
I'm using QGIS 3.28.5-Firenze.