I loan modification is held against you for 3 years.
Your approval was that a commitment? I don't think you had a commitment since no underwriter would have signed that commitment. Also your FICO is too low for Fannie Mae. They require 680+.
I feel you recieved a preapproval from a mortgage originator-not worth the paper it is written on.
You do not qualify for a mortgage until 3 years has passed from your modification and the lender puts down that you have paid as agreed for 36 months you are nonmortgagable.