Daily leaderboards allow anyone following exactly the same programming to compare themselves against each other.
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A 1-2-1 program allows a coach to create a training schedule specific to one individual.

Therefore, if the Daily Leaderboard feature was available in a 1-2-1 program, the one client who's following that program would always be number 1. They wouldn't have anyone to compare against.
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If you'd like to create leaderboards for people on 1-2-1 programs, you'll need to use the Challenge feature.

Here's an article on the difference between Challenges and Daily Leaderboards, and here's an article on how to use Challenges.

Thanks

FITR