Problem setting Grub password on RHEL7

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I'm sure I'm missing something very simple, but can someone help me with this?

Trying to set up a password so that the Grub menu can't be edited without authentication.

  1. grub2-mkpasswd-pbkdf2
    Enter password:
    Confirm password:
  2. Copy password hash
  3. Edit /etc/grub2/40_custom
    set superuser="root"
    password root
  4. Save file
  5. grub2-mkconfig -o /boot/grub2/grub.cfg

After rebooting, I enter 'e' at the boot menu. It prompts me for the user (I enter 'root') and then it prompts me for the password (I enter
) and then I'm back at the Grub menu.

What am I missing? This seems like it's supposed to be much easier than all this.

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