My previous reply was based on NFHS rules. I guess ASA makes this much more clear. Their rule 4-6-B spells it out.
B. A substitute shall be considered officially in the game when reported to the
plate umpire. The player does not violate the unreported substituted rule until
a pitch, legal or illegal, or a play has been made. The use of an unreported
substitute is handled as a protest by the offended team while the player is
in the game.
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