javax.ejb.NoSuchEJBException: EJBCLIENT000079: Unable to discover destination for request for EJB StatelessEJBLocator

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We are attempting to migrate our setup from wildfly 15 to jboss 7.4 in a domain model. We've been able to setup the domain/nodes and have them start and deploy all the apps. However we cannot get testing to connect to EJB. We know it is getting past the password, as if we put in a bad password, it fails with a different error

javax.ejb.NoSuchEJBException: EJBCLIENT000079: Unable to discover destination for request for EJB StatelessEJBLocator

We do not have depth of knowledge of how the previous setup worked, or that much about jboss. Looking for help understanding the necessary configuration that needs to be in place for this to work. I have compared the migrated config against the HA profile that comes with the install and done lots of trial and error, but cant seem to fix this. We have run the app/testing against a standalone configuration, and it is able to work (it also works against the old wildfly). We have also turned logging up to trace, but not seeing an obvious error in the verboseness.