Tell us what you are trying to do?
I'm having problems adding forms in the pages in a specific post types. When I test it, it says that the fields are empty and that an error occurred. Right now it only happens with this post type. When I add the form in another post type or on a normal page, it works perfectly.
What is the link to your site?
The post type is services (hidden link), and the form that is on the screenshot is on this page hidden link
I noticed the error on trying to submit the form, but I also see a number of "503 Service Unavailable" errors in the browser's console.
In simpler words, this error means that your server or the CDN (your website is being served through Cloudflare) is not able to handle the form submission request. Here is a more detailed article on the background and troubleshooting of the "503 Service Unavailable" errors: hidden link
I'll recommend testing the form with a minimum number of plugins and a default theme like Twenty Twenty-One and also testing with and without Cloudflare.
In case the issue still persists, you can report this incompatibility to Elementor's support team, for further investigation.