title: Single sign on in WordPress multisite 2019-2020
body: <p><a href="https://stackoverflow.com/questions/14829167/single-sign-on-in-wordpress-multisite">This question was asked in 2013</a>, but the answer is out of date (plugin <a href="https://premium.wpmudev.org/retiring-our-legacy-plugins/" rel="nofollow noreferrer">retired</a>).</p>
  
  <p>My question is:</p>
  
  <p>We want to install WordPress multisite with blog1.site.com, blog2.site.com, etc., all having single sign on.</p>
  
  <p>We need to make the transition between the sites seamless so they appear well-integrated as part of one domain.</p>
  
  <p>How can I make the same user logged in one of my sites automatically logged in when visit any other site from network?</p>