GRUB2 plain-text passwords work but encrypted passwords do not - Red Hat Customer Portal

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Issue

Cannot get grub2 pbkdf2 encrypted (hashed) passwords to work as described in the RHEL 7 Administration Guide
- Plain text passwords work as expected by putting something like the following in /etc/grub.d/01_users or /etc/grub.d/40_custom
```
cat <<EOF
set superusers="john"
password john johnspassword
EOF
```
- Changing the same to use encrypted passwords (as follows) does not work
```
cat <<EOF
set superusers="john"
password_pbkdf2 john
grub.pbkdf2.sha512.10000.049117C9....
EOF
```

Environment

Red Hat Enterprise Linux 7

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