Without your own Meta App in Live mode, AdFleet can't be connected — a token issued in Development mode "reads" accounts but doesn't create ads (Facebook #31/3858385).
- Go to developers.facebook.com → My Apps → Create App, type "Business". The app must live in the same Business Manager you'll launch ads from.
- Before generating a token, switch the app to Live: App Dashboard → App Mode → Live. If you generated a token earlier, it won't work for creating ads even after switching modes — you'll need to generate a new one.
- Connect the app to the BM: business.facebook.com → Settings → Accounts → Apps → Add → Connect an app ID. Don't see "Apps"? You don't have full access to that BM.
Next — the System User token guide.