rigidbody works only in master client

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Hello,
I made a 2D multiplayer ball game with Photon and Unity (max 2 players in one Room). The offline part is 100% working. But in the online part, only the Master client can interrect with the ball correctly but the other player can not interrect with the ball, to better detail: only in the Master's device the rigiditbody works well, but the movements of displacement two players work well. Please, I need a help, and a solution.