FAFSA/CSS first name problem?

Hi,I asked this question before but I would like some clarification.
I have two first names.On my common app,I only used the first name.However according to documents,there are 2 first names. So for FAFSA/CSS would i need to list the 2 first names or could i just list the name i used on common app? Would there be any complications?
Thank you for your help!

bump?

I can’t speak to how these two applications necessarily connect to the Common App - but for your FAFSA I would recommend putting your legal name as listed on your Social Security Card. I have seen a myriad of issues when the student puts a nickname or part of their name on the FAFSA and it does not match their SSN. I would then follow up with your school to make sure the FAFSA record is imported correctly under your personal student ID number after you have been admitted.