Very late for an answer indeed. I am sorry for that.
In few days, i will push an update for the last release of smartcopilot (3.1.3).
Some parameters must be identical on both sides (Master & Slave):
AIRAC
Flight plan in if you want to use a prefilled flight plan.
“Runway follows the terrain” should be the same “ON” or “OFF”
Mesh
Sceneries
Same location (gate or runway)
Same state (Cold and Dark or engines running)
Same plugins: Avitab, BetterPushBack….