"or person that will give a 1099 misc . to a self contractor . request that form ."

New for 2020, the form will be 1099-NEC. It used to be NEC, for Non-Employee Compensation, then it was rolled into the -Misc, and now it stands separately, again.

W4 and I9 are requested by the potential Employer. A person having only ITIN is not legally able to be hired, though.

It's hard to know what is meant by FIAN. For instance, perhaps they want proof of FEIN. We're stuck trying to be mind-readers.