In which scenario might a user receive multiple error emails?

Receiving multiple error emails can occur when a flow encounters nested failures during its execution. In this context, nested failures refer to scenarios where a flow that composes multiple sub-flows or activities encounters errors not just at the top level, but also within these sub-components. Each time an error is triggered, the system can send out an email notification to alert the user of that failure. This means that if there are several issues occurring at different points in a complex flow, each failure can generate its own error notification, leading to multiple emails being sent.

In contrast, if a flow runs successfully, there wouldn't be any error emails generated, as the flow operates as intended without any disturbances. If the flow is paused at certain elements, it would not result in error notifications but rather indicate that the flow is pending action. Lastly, when the flow executes in a single session, any errors encountered would generally be contained to that session, likely resulting in a single notification unless nested failures occur. Thus, the condition of encountering nested failures directly correlates with receiving multiple error notifications.