A Java RPM might be missing. Confirm both java Jdk installation packages exist. They are needed to launch the java app m6console in Windows redirect mode. The two installation packages are as follows:
java-1.8.0-openjdk-1.8.0.252.b09-2.el7_8.x86_64
java-1.8.0-openjdk-headless-1.8.0.252.b09-2.el7_8.x86_64