Confusion with Client SDK and Server SDK when in production

Hi guys,

this may sound as a stupid question, but I am really at a loss here. I admit I am a novice.

I have a simple CRUD web app built on NextJS, where some actions are performed by the user and some others by the servers. For example, the user registers through a multi field form. On the client side, the user info goes into auth. And the server is supposed to create a document in the collection for the user.

I am surely implementing the logic or understanding something wrong, because in local everything works just fine, but when I deploy to Vercel or Netlify, the server side seems not to respond to the requests. And the whole program just stops.

Taking the example of a form. As the user submits it, I want to use account.create with the email field and the password field (even though I guess this is also possible with the Server SDK). Afterwards I want all the fields to become part of the document in a collection of the db, therefore I use the Server SDK.

How should I set it up?

Thank you a lot