Isn't "parlo al mio amico" acceptable here? As far as I know, parlare con is interchangeable with parlare con, am I right?
Is "per computer" acceptable here? (Duo rejects it.)
Why is parlo con mio amico wrong? It says the error was that i spelled "con" wrong, the answer was "parlo COL mio amico"?
You need the defenite article. Con il mio amico = col mio amico.