Spark Environment Properties not applied during runtime from Pipeline Notebook Activity

Hi jisaac 
unlike Databricks, Microsoft Fabric doesn't currently support initialization scripts for Spark environments. In Databricks, these scripts let you apply settings automatically when a cluster starts, but Fabric doesn’t offer that feature yet.

you can manually set the Spark configs at the top of each notebook to ensure the necessary settings (like handling pre-1900 timestamps) are always applied. Alternatively, if you disable High Concurrency mode in pipeline runs, each notebook will start a fresh Spark session and correctly pick up the environment settings.

Another option is to create a small helper notebook that contains all your spark.conf.set(...) lines and use %run at the top of your main notebooks. This way, you keep things consistent without repeating code everywhere.

If the issue still persists we recommend you to raise a support ticket.

You can submit a ticket through the Microsoft Power BI Support Portal:

How to create a Fabric and Power BI Support ticket - Power BI | Microsoft Learn

Thank you.