[Vuejs]-Data not updating from Event Bus

Your event name is different while emitting and listening.

It has to be same for event bus to work.

Change your methods in Component A like so :

methods: {
    setTemplate(template) {
        bus.$emit("setEmailTemplate", template);
    }
}

AFTER EDIT

Without seeing more code, it would be hard to debug what problem you are facing.

I made a simple example of what you are trying. This might help you.

Working implementation attached.