$group = Import-Csv C:O365_EA_GrouptoPermissionList.csv

$group | ForEach-Object {
Connect-PnPOnline $_.url -Credential $userCred;
Set-PnPGroupPermissions -identity $_.groupname -List $_.library1 -AddRole "MySpecialPermission";
Set-PnPGroupPermissions -identity $_.groupname -List $_.library2 -AddRole "MySpecialPermission"
 }