https://www.ibm.com/docs/en/ibm-mq/9.0.x?topic=wsz-starting-sender-channel-qm1-zos
Starting the sender channel on QM1 on z/OS
If necessary, start the channel initiator, start a listener program, and refresh security. Then start the channel using the START CHANNEL command.
the senderstartingchannelqm1z