There are only three teams in serie A which Allegri's Juve couldn't beat away from home: Cesena (1 match), SPAL (2 matches) and Roma (5 matches). We beat everyone else at least once.
Now, a record of 0/5 is awful, but it has to be said that we mainly faced Roma in Rome in the last 2-3 rounds, when the scudetto was even theoretically secured.
Still, Roma are by far our toughest opponent away from home. During our domination in Italy under Conte and Allegri, we played them 9 times in Rome and we won only once, drawing 3 and losing 5 times.
At home though, we beat them 9 times out of 9 (8 in serie A, once in Coppa).