Forgot to put SSN on Common app.

Hi, I realized that I forgot to put in my SSN on my common app and already submitted it to several schools. I filed my FAFSA several weeks ago. I know that I need to my SSN on my common app for financial aid through FAFSA. Should I and can I still call these schools’ offices to put in my SSN before their priority deadlines for financial aid even though I already submitted my FAFSA and got accepted to those schools?

Yes, call them.