I tried to run your flow but system prompt error as shown
[ERROR] [UiPath.Studio.exe]  System.ServiceModel.ActionNotSupportedException: The message with Action ‘http://tempuri.org/IUiPathRemoteDuplexContract/SubscribeToEvents’ cannot be processed at the receiver, due to a ContractFilter mismatch at the EndpointDispatcher. This may be because of either a contract mismatch (mismatched Actions between sender and receiver) or a binding/security mismatch between the sender and the receiver. Check that sender and receiver have the same contract and the same binding (including security requirements, e.g. Message, Transport, None).
Any idea what was the problem?