Sentance was given Quand vous y êtes retourné whereas the correct is Quand vous y êtes retournés
Maarten is correct! The sentence you are referring to is using 'vous' as one person ('single you' / no -s to the past participle) and not as a group of people ('plural you' / an -s to the past participle). See link below for agreement of the past participle in Le Passé Composé:
Case of agreement with vous
I hope this is helpful.
Bonne journée !
Not if ‘vous’ is singular, rather than plural. Do you have the context ?
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