pam_script.so access NFS mount

I have setup authentication with a script with pam.
auth required pam_script.so dir=/etc/pam-script.d

Works fine

But when I try
auth required pam_script.so dir=/net/nfsfileserver/pam-script.d
it doesn't work any more.

also when I try to access a nfs mount from within the "/etc/pam-script.d/pam_script_auth" script I get "permission denied"

With pam_exec.so same result.

I seems that I can't access a NFS mount from pam_script.so or pam_exec.so.
Is there a way around this?

With pam_exec same result.

I use centos 7.