@NickRiches
In additiion to what @chriscas mentioned, you mentioned the eyeball showing up in the gradebook which means the grading for the quiz may be set to manual release. That setting prevents the students from seeing their own answers (speaking from classic quiz standpoint). to post the grades, in the gradebook, click on the ellipses next to the assignment at the top and make sure "all grades posted" shows and is grayed out. if the option says "post grades", then select that and select the option to post all grades. I know in classic quizzes you can just go back and select to release the answers after a quiz has been taken - that is what I do.