In which situation is service not required for a party?

In legal proceedings, service of process is generally required to notify parties involved about ongoing litigation. However, there are specific circumstances where service is not necessary, one of which is when a party is in default for failing to appear. In this situation, the court has already established that the party has not responded or participated in the proceedings as required. Because the party has not engaged with the process, the court can proceed with the case without needing to serve them again, as they cannot contest the service due to their default status.

In contrast, the other scenarios involve parties who have either filed claims or engaged with the litigation process, where proper service is crucial to ensure all parties are adequately informed and are given a fair opportunity to respond.