The queue manager being tested has not received any information from the full repository queue manager that is targeted by the manually-defined cluster-sender channel.
The manually-defined cluster-sender channel must be in the Running state. Also, check that the cluster-receiver channel definition, and its Connection Name and cluster-related attributes, are correct.
After defining the channel, it might take some time for the remote queue managers to complete a retry cycle, and restart their channels with the corrected definition.
IBM MQ Queue Manager Clusters provides further information about troubleshooting cluster problems.