The only Kwiz in that lesson with 'soyez' was:
Je vais vous ramener chez vous avant que vous ne soyez fatigués
I am going to bring you home before you are too tired
So the context is there, you are talking about someone you say the polite 'vous' to or to a collection of people. The 'tu' form would be incorrect in that sentence.
Bonne Continuation !
Both are grammatically correct of course, so depends on whether there was a “contextual” indicator of formality or plurality. Do you remember the full sentence/question ? May be best reported through quiz report button, as easier to have this checked from there.
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