Hi,
Nonces are a security measure in WordPress. In this specific case they are used to make sure that the form is being submitted through the website.
What happens is that either the nonce field is empty or has a wrong value for some reason.
But it’s a bit of a weird issue that it’s not working out. If WordPress nonce functionality did not work for some reason you’d have trouble doing pretty much any action in the admin panel/dashboard. Every single action in there uses nonces.
So, let’s test out and figure out what’s going on.
First thing to do is switch to a default WP theme and then try the contact form. Just a quick switch, once you try the form switch back to your theme.
If that does not work out, send over a list of plugins you are using, I’ll install them on my WordPress site and see if I get the same issue.
Also, please send over the URL to the page with the contact form, I can see in there if for some reason the nonce value is empty.
