The see this issue, we need 2 players that is on the same team where the option "friendlyFire" is activated.
What I expected to do :

When attacking the other players, wolves of this player will aggro me.
What it does :

Wolves stay still.

• Create team

• /team add test
  /team modify test friendlyFire true
  /team join @a

• Tamed a wolf
• Attack the other player