Reason of a 404 response when submitting a form

What’s up guys?
What could be the reason(s) for a 404 response when I submit a simple form (server connect POST form) with the following steps in my API action?
I have plenty other form that submit well, but not this one.

Can you share a screenshot of the error message please?

I just see it on the browser dev console:

There is this too, if it helps:

Please make sure your server action is uploaded to your server, this error means it cannot be found there.

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Got it, thanks.
So 404 here means that dmxConnect/api/Admin/confirmCons.php could not be found in the server.

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