"In the message" would refer to the words and their meaning. "On the message" would more likely refer to the sound, or the inflection of your voice. Can you say "the more the time passes"?
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alc24I got the exam on/in my first try. (I'd say ON)Putting aside the unrelated flaws in your sentences, I agree with you.
I was able to in/on one try. (I'd say IN)