Form 7 not tracking events for Google Analytics

Hi

Thank you for the great plugin.
I tried tracking with your help article exactly and it’s not registering the event.

I had some problems with the success message not displaying after I put in the additional settings.
on_sent_ok: “ga(‘send’, ‘event’, ‘Contact Form’, ‘Submit’);”

However … after several attempts, it’s now showing the success message but not tracking the events on GA. Any ideas why? Thanks in advance