What's wrong with "Jem sniadanie po rano"?
why not "jem rano śniadanie"?
Doesn't sound very natural to me, although it's hard to say 'why'. It's probably not incorrect per se...
Why doesn't "Jem śniadanie w rano" works?
because "in the morning"= "rano". there is no "w rano" in Polish.
Why"jem śniadanie rankiem" is doesn't corrext?