After investigating this issue, it relates to the fact that these users are new and do no have enough unlistened recommended tracks yet, so daily jams cannot generate a playlist. A fallback should be put in place, complete with a note to the user telling them to listen to more music.

Original text:

Despite following troi-bot, two users have reported that there are no daily playlists generated for them.

I have confirmed both are following the user troi-bot, and so for a few weeks.
Both have weekly playlists generated for them as per usual.

Not sure why troi-bot ignores them, or if we have a limit of number of users we generate playlists for, or...

Users duddy_f and KylianLM.