In case anyone down the line still have issues, I found that if you’re rendering from blueprints you need to add a a “Find or Add Setting by class” then set it to “Movie Pipeline Widget Renderer”, drag the return value and type composite and and the “Composite onto final image” node should pop up, drop that, enable to checkbox and link the return value from the find or add setting by class node to its target. Hope this helps
Posting this fix on a couple threads to spread the word