This happens when you create a poll with access groups “everyone”. If there is another group selected it doesn’t pop up. My language setting are set to default.
I tested with another language (Dutch) similar error).
Further testing seems so imply that this happens when you aren’t a member of the group that is allowed to vote. (Although weirdly, shouldnt everyone be in group ‘everyone’ …)
@joffreyjaffeux I think there is a legit issue in that everyone should not even be selectable here. We need a special rule to say you can not choose that. Leaving empty should be implicitly everyone imo.