autoLogin appears in manual, but does not work

While trying to make autoLogin work, I saw the corresponding section in the NixOS 20.09 manual (see here). This didn’t work, nixos-rebuild switch tells me the option does not exist. However, doing, for example, ...sddm.autoLogin.enable = true; instead of just ...autoLogin.enable works.

Is this an error in the manual, or in the code? Or even an error at all?

Do you actually use 20.09? https://github.com/NixOS/nixpkgs/pull/85065 is not part of 20.03.

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Thanks for reminding me! Indeed I haven’t updated yet. Foolish of me…