P2NP = phenyl-2-nitropropene?
If yes, it is not surprising your hoped reaction does not work. The Zn/HCl reduction does work for nitroethenes, for instance in the reduction of 3,4,5-trimethoxy-nitrostyrene or 2,5-dimethoxy-nitrostyrenes. I can personally testify it works for 3,4,5-trimethoxy-NS. However, this type of reduction does NOT work for nitropropenes! It will give you a combination of the aimed amine (in very low yield) and the ketone (in your case, P2P). There is some information on Rh's site on this topic, and I'm sure you can find even more using TFSE. It worked for me when I needed it. Here is a start: Post 245040 (https://www.thevespiary.org/talk/index.php?topic=11784.msg24504000#msg24504000)
(Rhodium: "O Leminger's Phenethylamines - posted by Karel", Novel Discourse)