Contact Child Site Admins

Thank you for your response. I took a wild stab at building a WordPress plugin that would: 1) get the subsites, then identify the administrators on each subsite, then tag each of those administrators with something (cs-admin), create a dashboard, populate the tagged users into a sortable table in the dashboard that you can download to CSV, and to undo any changes the plugin made if you uninstall it. Could you take a look at this for me? Here is the code:

    <?php
    /* 
        Plugin Name: Multisite User Tagging 
        Description: A plugin to tag users in a WordPress multisite network 
        Author: ChatGPT
        Version: 1.0.0  
    */

    // Get all sites in the multisite network using wp_get_sites() function

    $siteList = wp_get_sites();

    foreach($siteList as $site){

    // Query for administrators of each site using get_users() function and add cs-admin user meta tag with add_user_meta() function

    foreach($siteList as $site){
		$args = array('role' => 'administrator');
    	$admins = get_users($args);
    	foreach($admins as $admin){
    		add_user_meta( $admin->ID, 'cs-admin', true ); 
        }  
    }

    // Create dashboard page and add it to the admin menu 

    function mstagdashboard(){ ?>

        <div class="wrap">  
            <h2><?php _e('Tagged Users') ?></h2>  

            <
    // Query for tagged users using get_users() function 

    $args = array(
        'meta_key' => 'cs-admin',
        'meta_value' => true,
    );

    $taggedUsers = get_users($args); ?>  

	<table class="wp-list-table widefat fixed striped posts">  
    	<thead>  
        	<tr>  
            	<th><?php _e('Name') ?></th>  <th><?php _e('Email') ?></th>  <th><?

    <?php 
    // Create CSV file with tagged users 

    if(isset($_POST['exportCSV'])){  
    	$filename = 'tagged-users.csv';  
        $fp = fopen($filename, 'w');  

        $headerRowArray=array();  
        $headerRowArray[]='Name';  
        $headerRowArray[]='Email'; 
    	$headerRowArray[]='Site';

    	// Write header row to csv file 

    	fputcsv($fp,$headerRowArray);     	      	     	        

    // Display tagged users in a table on dashboard page 

    <table class="wp-list-table widefat fixed striped posts">  
        <thead>  
            <tr>  
                <th><?php _e('Name') ?></th>  <th><?php _e('Email') ?></th>  <th><?php _e('Site') ?></th>  
            </tr>  
        </thead>    

        <tbody id="the-list">

        // Loop through each user and write to csv file 

        foreach($taggedUsers as $user){  
            $row=array();  
            $row[]=$user->first_name.' '.$user->last_name; 
			$row[]=$user->user_email;   
            $row[]=get_bloginfo('url');   

            fputcsv($fp,$row);  
        }  

        fclose($fp);        

        // Download CSV file with tagged users 

    	header("Content-type: text/csv");  
    	header("Cache-Control: no-store, no-cache"); 
 
   // Create uninstall hook 
    register_uninstall_hook(__FILE__, 'mstag_uninstall');

    // Uninstall function 
    function mstag_uninstall(){
        delete_user_meta('cs-admin');
    }