Add recursive permissions to public folder for all users in CSV

I have a public folder that needs grant several users the reviewer permissions

I know i can run this command for each user like so

Get-PublicFolder -identity "\Internet Newsgroups\Medical Providers/Medical Staff Conference\Privileges" -recurse |
add-publicfolderclientpermission -accessrights reviewer -user user

but i need to run this for around 100 users so i attempted to change this command

Get-PublicFolder -identity "\Internet Newsgroups\Medical Providers/Medical Staff Conference\Privileges" -recurse |
add-publicfolderclientpermission -accessrights reviewer -user user1,user2

it did not like the coma value so i setup a variable

$users= import-csv C:\pfuser.csv
foreach ($user in $users){
Get-PublicFolder -identity "\Internet Newsgroups\Medical Providers/Medical Staff Conference\Privileges" -recurse |
add-publicfolderclientpermission -accessrights reviewer -user $users
}

Now the command runs however the script displays in powershell and shows no output

im sure im missing something obvious. could someone point it out to me?

Thanks