If you are doing the work in the United States it is not foreign income and is not eligible for the foreign earned income exclusion. It doesn't matter that the client who is paying you is in a foreign country. Foreign earned income is income that you earn for work that you do in a foreign country.
You enter the income as business income that was not reported on a 1099-NEC or 1099-MISC, the same as if the client were in the U.S.
