Hi,
in my case plugin works perfectly until I install add-on GDPR Compliance for MailChimp. After that if I update any of forms, it breaks them by showing:
“We’ve encountered an error. No list ID was sent.”
After that, nothing works. Even if I delete and create a new form, reinstall plugin. But if I disable GDPR Compliance for MailChimp, I am I able to create new forms with no problems. But old forms never work again.
So if you use this add-on, try disabling it.
Marty