Kernrechtsfrage
Whether the appeal must be entertained despite the missing power of attorney not being filed within the deadline.
Extrahierter Entscheid
The appeal could not be heard because the formal defect was not cured within the extended deadline.
Extrahierte Begründung
After the court indicated the missing authorization under Art. 42(5) BGG and set a grace period, the appellant did not submit the power of attorney in time. The late request for extension could not revive the expired deadline, so the appeal was manifestly inadmissible and non-entry followed under simplified procedure.