If it is a joint return, get the FSA ID for the parent listed 1st on the return. Make sure the name on the SS number matches exactly. If you used a different name on the tax return (Jim instead of James), I think you will continue to have a problem. The IRS should have rejected the return but they don’t always.
Make sure the name matches exactly. If you have an apartment number, don’t put it on a separate line. Keep trying different combinations for the address. It is a finicky system & I am often surprised at the little difference that kept it from working.