Update tutorial-get-started-with-feature-store.md

Added a note about timestamp column format.

Author: ynpandey

articles/machine-learning/tutorial-get-started-with-feature-store.md

@@ -500,6 +500,7 @@ The Storage Blob Data Reader role must be assigned to your user account on the o
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    > [!TIP]
+   > - The `timestamp` column should follow `yyyy-MM-ddTHH:mm:ss.fffZ` format. 
    > - The `feature_window_start_time` and `feature_window_end_time` granularity is limited to seconds. Any milliseconds provided in the `datetime` object will be ignored.
    > - A materialization job will only be submitted if data in the feature window matches the `data_status` that is defined while submitting the backfill job.
 
@@ -570,4 +571,4 @@ The [fifth tutorial in the series](./tutorial-develop-feature-set-with-custom-so
 * Learn about [feature store concepts](./concept-what-is-managed-feature-store.md) and [top-level entities in managed feature store](./concept-top-level-entities-in-managed-feature-store.md).
 * Learn about [identity and access control for managed feature store](./how-to-setup-access-control-feature-store.md).
 * View the [troubleshooting guide for managed feature store](./troubleshooting-managed-feature-store.md).
-* View the [YAML reference](./reference-yaml-overview.md).
+* View the [YAML reference](./reference-yaml-overview.md).