Mailchimp offers some great features for building your mailing list. One of the best is the slick popup signup form that easily integrates with your existing WordPress site. However, when you do set one up, you may initially think that it’s broken because it doesn’t display when you test it live.
A common mistake people make is to test the form on the same browser they are logged in to their WordPress account with. However, because you are logged in, the Mailchimp popup won’t display. You may try the different options of scroll to bottom, after 5 seconds, on exit, etc. None of them will work.
What you need to do is to test from a different browser or an Incognito/Private tab.