This is highly unusual for Duo, but it seems they didn't approve all the gender possibilities for this sentence. Furthermore, the proper words for the suggested answer were not even given in the word bank! (אתן חייבות לשמוע את זה!)
Does this convery an obligation, like a boss or a superior telling his/her employees/underlings you MUST hear this? Or a sort of invitation, like when a friend my tell you, you must hear this? Could it be both?