Who is wrong, AMP or the CME?

You are looking at Maintenance Margin on the CME not initial. $6800 is correct.
First of all, I'm not asking about initial margin. Second, according to the CME, initial for ES would be $6,600, not $6,800 as you state. But thanks for attempting to answer.
 
I think AMP should slightly modify the message to say that "MINIMUM Maintenance Margin is set by the exchange (not including daytrading margin)." The FCM can (and will) exceed exchange minimum margin requirements at times. Interactive Brokers does this a lot.
 
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