Thank you for posting in the PowerSchool Community for assistance!
Would you please confirm are you receiving an error message while re-enrolling your child? If yes, would you please provide the screenshot of the error message to troubleshoot and assist you further?
Thank you for sharing this information.
Since the child has already been registered at the beginning of the school year, we recommend reaching out to the school or district directly who should be able to assist you in re-enrolling your child.