Dotenv : Are the environment variables not loading in the `production` environment of your Rails application?

You have configured your .env for all common environment variables across environments but they are not loading in production environment.

Here is a catch in the intallation doc.

Here you can see that the document mentions to install the gem only in development and test environments and you just copied and pasted as is in your Gemfile !

The fix is simple. Just remove groups: [:development, :test] or put the dotenv-rails gem outside of all environment like ohter gems required in all environment.