I don't know what I'm missing.
On Sanctuary, I have the Recruitment Radio Beacon on.
If I look on Data, Workshops, I see no warnings on anything. Everything seems fine.
10 people, 18 food, 49 water, power 24, defense 84, beds 14, happiness 80. It's been like that since I was level 10 or something. Now I'm level 29. Nothing changed. No new settler. And now that I think about it, I believe none of those 10 people were "recruited" by the radio beacon thing. They're the original gang you get when you start the game, a couple of companions and one random guy that I sent from another settlement.
I even try to boost charisma even further, currently 6, but apparently it has no effect.
What am I doing wrong ?