Script to add an AD Security group to multiple User Home drive folders

Nitrox 

# Set the name of the AD security group to create
$GroupName = "ADMigration"

# Create the new AD security group
New-ADGroup -Name $GroupName -GroupScope Global -GroupCategory Security

# Set the list of home drive folders to modify
$HomeDriveList = @(
    "\\server\share\user1",
    "\\server\share\user2",
    "\\server\share\user3"
)

# Loop through each home drive folder and add the AD security group to its ACL with Read access
foreach ($HomeDrive in $HomeDriveList) {
    # Get the current ACL of the home drive folder
    $acl = Get-Acl $HomeDrive

    # Create a new Access Rule for the AD security group with Read access
    $rule = New-Object System.Security.AccessControl.FileSystemAccessRule($GroupName, "ReadAndExecute", "Allow")

    # Add the new Access Rule to the home drive folder's ACL
    $acl.SetAccessRule($rule)

    # Set the modified ACL to the home drive folder
    Set-Acl $HomeDrive $acl
}

You will need to update the $GroupName and $HomeDriveList variables to match your environment. Also, make sure to run the script as an administrator and that the account you use has sufficient permissions to modify the ACLs of the home drive folders.