We've set up a new website, based on Wordpress. We use Google Tag Manager (as on the old website) and new for this website, Google Analytics 4. We're getting a lot of data as you'd expect, but we're not getting any data on engagement time. There doesn't seem to be any problem with other events, but the user_engagement event doesn't seem to be firing. It should be automatic, so there's nothing I can do to turn it off or on. We're also still using universal analytics, but from what I've read, they should be able to work side by side.
How can I go about tracking down why this event isn't firing? (Other events are working: page_view, session_start, first_visit, scroll.)