"Is that guaranteed?"

Translation: Wird das gewährleistet?

[Doctor-John]

Duo accepts "Wird das garantiert?"

Although this is a lesson on passive voice, I think Duo should also accept "Ist das garantiert?" and "Ist das gewährleistet?"

[Dalingo8]

Ist das garantiert - accepted, July 2019

[BorisKovac77]

Agreed. That would be correct as well.

[AndrsSzala5]

I think this passive topic comes way too late in this course. And it's even fairly short. Are you planning a revision?

[DawsonDarl]

Sicherheit ist nicht gewährleistet.