Following the instructions here for a binary installation on top of a GNU\Linux system I get "Permission denied" when I attempt to authorize substitutes.  What permissions should hydra.gnu.org.pub have?  How can i correct this issue?

https://www.gnu.org/software/guix/manual/guix.html#Installation

7.To use substitutes from hydra.gnu.org (see Substitutes), authorize them:

# guix archive --authorize < ~root/.guix-profile/share/guix/hydra.gnu.org.pub

This is what happens to  me:

[term ~]$ guix archive --authorize < ~root/.guix-profile/share/guix/hydra.gnu.org.pub

bash: /root/.guix-profile/share/guix/hydra.gnu.org.pub: Permission denied

The same thing happens with sudo:

[term ~]$ sudo guix archive --authorize < ~root/.guix-profile/share/guix/hydra.gnu.org.pub

bash: /root/.guix-profile/share/guix/hydra.gnu.org.pub: Permission denied

Respectfully,

Marc