It shows they are still unlocked on my side but show they are locked on student side.
Thanks for writing! Students can indeed retake assessments in any course; just unlock that assessment again for them, and any subsequent attempts will overwrite their previous attempt and submitted answers. If you haven’t yet, please contact us at support@code.org via email and we can investigate the issue at hand here with students still unable to access an assessment for the 2nd+ time.