I did run into an issue when trying to activate Mailchimp in an localhost env (xampp).
After filling in the Mailchimp API key it didn’t work, but it didn’t give me an error message either.
I just found out what the issue was and managed to solve it by following these steps:
Sorry for the late reply.
I didn’t get any error message from the Beaver Builder subscribe module; it just didn’t work.
An error message would have helped though
Because it didn’t work I decided to try out Yikes’ Easy Forms for MailChimp.
This plugin gave an error message after saving the Mailchimp API key. After following the steps mentioned earlier, both the Beaver Builder subscribe module and the Easy Forms plugin worked.
The error (from Yikes’ Easy Forms for MailChimp) was: “API call to helper/ping failed: SSL certificate problem: unable to get local issuer certificate”