Why is my playstyle inactive?

Your playstyle can appear as inactive if:

You haven’t unlocked it for the player in question. Make sure to check the Profile - Playstyles tab for the player and his level. If its level is LOCKED, it means you have to collect playstyle points and unlock it there.
If a player’s playstyle is unlocked, check which role is linked to his playstyle and what his position on the pitch is. The role tied to the playstyle and his position on the pitch must match in order to have the playstyle active.