Datalab is intended for use in a command environment. Laptops may contain code execution results (for example, BigQuery SQL query query) and are available to project members. Therefore, Datalab uses the App Engine service account in your project to access data. This provides unified access for browsing and running laptops and minimizes the risk of accidental disclosure. If you do not control access to data, you may need to provide access to the service account. You can find the service account in the Developer Console by clicking "Permissions" in the left navigation bar and find the App Engine service account. Datalab does not currently use individual user credentials.