In which scenarios do Force Events fail to operate?

Force Events are a special communication mechanism in Salesforce that allows components to send and receive events, enabling them to respond to changes in other components. However, Force Events are specifically designed to work in the context of Lightning Components and certain events are limited to certain environments.

The scenario where Force Events fail to operate is within Flow Builder. Flow Builder is used to create and automate processes in Salesforce without requiring code, but it is not designed to leverage the event-driven architecture that Force Events provide. Flows are typically designed to work within their own context and do not support the same event propagation model as Lightning components do. Thus, trying to use Force Events directly within Flow Builder would not work, as the Flow is not a Lightning component that can subscribe to or fire these events.

In contrast, options like mobile devices, external applications, and Lightning pages provide contexts where different forms of solutions for invoking or listening to events are possible, but they do not directly pertain to the limitations inherent to Flow Builder itself when it comes to Force Events.