To be able to retrieve values from fields in the form and present them in the email notification sent as Action, you must have the fields set with a name.
All field types have the option to set a name for the field. This is located under Advanced Settings for all fields. The names you give your fields should be unique and not contain Å, Ä, Ö, or other special characters. Dashes and underscores are allowed and the names can have a maximum of 191 characters.