Nix-env fails just after install (Darwin)

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I installed nix as per the instructions: Download Nix / NixOS | Nix & NixOS and have

dom@Ember ~ % nix-shell -p nix-info --run "nix-info -m"
nix-shell -p nix-info --run "nix-info -m"
 - system: `"aarch64-darwin"`
 - host os: `Darwin 22.5.0, macOS 13.4`
 - multi-user?: `yes`
 - sandbox: `no`
 - version: `nix-env (Nix) 2.16.1`
 - channels(root): `"nixpkgs"`
 - nixpkgs: `/nix/var/nix/profiles/per-user/root/channels/nixpkgs`

So note the root user. If I try to install via nix-env then

dom@Ember ~ % nix-env -i direnv
nix-env -i direnv
installing 'direnv-2.32.3'
error: opening lock file '/nix/var/nix/profiles/per-user/dom/profile.lock': No such file or directory

And indeed there is no dom; there is only root.

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Please check if there is an existing issue and either upvote that or file a new one: Issues · NixOS/nix · GitHub