Server Action not working on 404 pages

[adrienbailliard78-67 (Louis------)]

Hello Vercel Team,

I am experiencing an issue with a server action.

In my site’s header, users can subscribe to a newsletter using the “Inscris-Toi” button. While this works perfectly on the homepage (https://adrienbailliard.com), the action fails to trigger on the 404 page (https://adrienbailliard.com/404).

This issue only occurs in production on Vercel; I cannot reproduce it in my local production build.

Here is a minimal repo to reproduce the issue: GitHub - adrienbailliard/vercel-server-action-issue.

What should I do to fix this?

Thanks!

[system]

There’s another community post with 404 debugging tips that might be helpful. Please give these solutions a try and let us know how it goes.

Debugging 404 Errors

Sometimes things don’t go as expected when deploying a website. If you see a 404 on your site, that means the page or resource couldn’t be found. There are many possible causes, and the absence of something can be tricky debug if you don’t know where to look. Here are some things you can do to find the cause and fix it. Debugging Tips Check the error code If you see a mostly white screen with 404: NOT_FOUND along with a Code and and ID then you can click the blue info box below the error deta…

A human should be around soon to offer more advice. But you can also get helpful information quickly by asking v0.