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Help! Cub S+ Flaps's Channel 7CH not actioning the servo/ HELP!!!

I'm currently installing the parkzone PKZ1090 on my Cub S+ for flaps, and chanel 7, the one for the flaps, wont move it.
I'm currently binded with an DXe with flaps switch and all perfect, and if a connect the new servo on the rudder it works propperly.
Isn't it only plug and play, or what can i be missing. I,ve seen videos and only need is to connect it, then all is ready to work..
Can somebody help me please or advise me?