I am getting "Exception: StudentIdentifier: 173474 not authorized for user." when I try to do the "Annual Student Update." I was able to do it for my daughter, I am not trying to do it for my son.
This could be due to an SSO error. Single Sign-on (SSO) is a method of accessing your student's registration forms via the PowerSchool Parent Portal.
We recommend reviewing the article linked below for more information on troubleshooting these errors.
Troubleshoot Error Message When Accessing SSO Registration.
Let us know if this helped or in case of further queries.