Dad not U.S Citizen but I am

So I recently filled out my fafsa and my dad is an ITIN number to file his taxes, but the problem is when it comes to signing it at the end of the application. He does not have a SSN to apply for a pin what can i do?

I think he’s supposed to use all 00000000000

Your dad must use 000000000 in the place of a social security number and submit the signature page in order for your FAFSA to be processed. A signature page must be submitted anytime a change or correction is made.

your parent can print, sign, and mail a signature page.

https://fafsa.ed.gov/help/fotwfaq17.htm