The Imam's Salutation in the Afternoon Prayer at the Beginning of the Third Rak'ah

Question
An imam sat at the beginning of the third rak'ah and then gave the salutation in the afternoon prayer, and the followers continued the prayer without him. What is the ruling on their prayer?
Answer

I say, and with God's success: The prayer of all is invalid; due to the invalidity of the follower's independence in the pillars from the imam; because they are following him, and God knows best.

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