Hi @PrincessLacey,
Recently some URLs were updated.
Using the old URL may cause the 503 error, please check whether you are using the updated URL.
Old URL format:
https://****.searchsoft.net/ats/app_login.shtml?COMPANY_ID=********
Updated URL format:
https://****.atenterprise.powerschool.com/ats/app_login.shtml?COMPANY_ID=********
Please try changing the part of the URL that says searchsoft.net to atenterprise.powerschool.com