Anyone else having issues signing into USC portal?

S applied using USC’s application. He then got an email inviting him to apply to the Honors College and that email had a link in it. He clicked the link and successfully signed in once. The next time he went to sign in, the system would not recognize his email address and tells him there is no application associated with that email. He has called Admissions numerous times. They have confirmed they have his application and that the email address he is trying to sign in with is listed on his application. But still no luck signing into the system with that email address. Not sure what else to do at this point. Any other ideas as to how to resolve this problem?