AMQ9639 Remote channel … did not specify a CipherSpec. 2393 rrcE_SSL_REMOTE_BAD_CIPHER

In my mqclient.ini I had

CHANNELS:
ServerConnectionParms=QMACLIENT/TCP/127.0.0.1(1414)

You cannot use this for TLS clients.   You need to use a CCDT  AMQCLCHL.TAB