Thank you! I’ve now also found this answer to a similar problem Running nixos-rebuild across platforms - #10 by ElvishJerricco, and if I understand things correctly, the issue arises from nixos-rebuild “updating” itself to use the aarch64 version of nixos-rebuild, which doesn’t work on my computer. However, when adding --no-reexec it skips the in-place update, runs “normally”, and therefore works. Correct me if I’m wrong!