When building forms using the Divi Multistep Contact Form plugin, you may come across a submission error that says “Make sure you fill in all required fields” even if you’ve filled in all required fields.
This is actually a pretty straightforward and simple fix. The issue is caused by the fact that when you add a new form step field, Divi sets this as a required field by default. When you go to submit the form, however, there will not be a value for this field (since it’s a form step, not a field) and Divi will throw this error.
To fix this error, be sure to set the Required Field option for all of your form steps to No.
Be sure to clear your cache!
Once you’ve made this change, be sure to clear any caching plugins active on the website just to be safe. After that, your Divi Multistep Contact Form should be submitted as expected.