ejb3 not being part of standalone-microprofile(-ha).xml configs, the script fails to apply.

The line in the script: https://github.com/jbossas/jboss-eap7/blob/7.4.x/ee-feature-pack/common/src/main/resources/content/docs/examples/enable-elytron-se17.cli#L37

Should be rewritten to check for ejb3 subsystem presence:

if ( outcome == success && result.application-security-domain.other == undefined) of /subsystem=ejb3:read-resource(recursive)

...