Missing or ignored variables

Your app's output says Error: FRONTEND_URL must be configured, APP_ORIGIN is required, DB_CONNECTION must be set, or a value is undefined.

Your app reads a variable that the project doesn't have. Your local .env file isn't uploaded or committed, so its values don't come along.

Add the variable in the project's Variables tab (or paste your whole .env), then Redeploy.

For addresses, use your app's real one, like https://my-app.dockhosting.cloud. APP_URL is set to it for you.

The new value doesn't show in your app.

A running app keeps the variables it started with, and frameworks like Next.js and Vite bake NEXT_PUBLIC_* and VITE_* into the build.

Press Redeploy after changing variables. It rebuilds, so build-time variables update too.

The app connects to the wrong database, or to localhost, although a database is linked.

You set DATABASE_URL (or a DB_* variable) yourself. Your own value always wins over the linked database's.

Delete your own DATABASE_URL / DB_* in Variables and redeploy. See Database connection.