Hi Roy!

sorry, I know nothing about NASes.

That said, can you provide more details, e.g. the exact response that
you get.

> I am wondering whether I am running into a permissions issue. Obviously
> when I install nfs-utils I am running this as myself rather than the
> system.

In my understanding, mounting tools are setuid programs and as such
should be installed as part of your Guix System, not as user.  (To be confirmed.)

Hope that helps!

-- 
Pierre Neidhardt
https://ambrevar.xyz/