Noting that an appeal against an interlocutory order would only be receivable in instances when it is clear and manifest that UNDT exceeded its jurisdiction or competence, UNAT actually rejected the Secretary-General’s appeal on the basis that it was moot. UNAT noted that UNDT had since disposed of the underlying case by Order No. 169; (NBI/2020) because the former staff never filed an application with the tribunal, even after being granted an extension.