Vague Refresh Failure message: We're sorry, an error occurred during evaluation

Hi jakaihammuda ,

Thanks for checking on this further.

The “Change Data Source” option being greyed out usually means the connection is defined in the M code rather than exposed through the connector dialog, so the command timeout setting cannot be adjusted from the UI.

It is also important to note that the Command Timeout option is only supported in the SQL Server connector. For other connectors, including Databricks, the setting does not surface in the same way.

You can see a related discussion here: Timeout constantly when refreshing.

For Databricks, the practical options are to review query performance and, if needed, configure the STATEMENT_TIMEOUT  parameter on the Databricks side. Power BI Service will still enforce its own refresh limits.

Since the issue seems related to the startup time of the serverless warehouse, you may want to test with a provisioned SQL warehouse or keep the warehouse active to avoid the initial delay.

Hope this helps. Please reach out for further assistance.

Thank you.