Questione giuridica chiave
Whether the appeal met the federal formal requirements, especially a sufficiently reasoned challenge under Art. 42 BGG.
Decisione estratta
The filing did not contain a proper, case-related reasoning and therefore did not constitute a valid appeal.
Motivazione estratta
The appellants were expressly warned of the requirements, but their submission still failed to show in a substantiated way how the challenged decision violated federal law; the warning remained unanswered.