title: IdentityServer4 with multiple instances
body: <p>I have two docker containers with the same image of our OAuth Server with IdentityServer4 managed with Docker Swarm (I don't take care of this).</p>
  
  <p>The problem is that the token sometimes is valid and sometimes not when it's valid (401 Unauthorized).</p>
  
  <p>We tried leaving only one instance running and the problem was solved, but we need two.</p>
  
  <p>How can I configure multiple instances of the server?</p>
  
  <p>Notes:</p>
  
  <ul>
  <li>We are using the <code>AddDeveloperSigningCredential()</code>. I don't know if it will affect or not.</li>
  <li>It's a test environment with <code>ASPNETCORE_ENVIRONMENT=Development</code></li>
  </ul>