How to test pop-ups on my site?

I am on WordPress. I installed the Klaviyo plugin, configured it, and connected my site with my Klaviyo list.
I created a pop-up that triggers at around 25 seconds and also as an exit-intent.

When I go to my site and wait for the 25 seconds (or more), or when I try to exit the site, no pop-up shows up.

How can I troubleshoot to identify what may be wrong?

As the site is new, I am still in the free tier of Klaviyo, and do not have access to their chat support.

Thank you.