The problem is that your item only has a Collectability of 1 - thats not enough to turn it in. It needs to have at least a Collectability of 50 to be turned in - in order to reach that you have to increase the Quality during your craft by using "Touch"-actions ("Basic Touch" being the most, well, basic one). You dont want to just finish the synthesis, but also increase that quality - the more, the better since your reward will increase if you go above 50.