title: Strapi returns error code 400 on user registration
body: <p>Strapi user registration returns error 400 Bad Request every time I try to register a test user, however the user does get created in the Users collection.</p>
  <p>I am using the standard Strapi Email plugin (not the Send grid plugin), everytime I register a user, this plugin does not send an email which leads to be unable to confirm the user.</p>
  <p><a href="https://i.stack.imgur.com/BNHuk.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/BNHuk.png" alt="strapi returns error code 400 on registering users" /></a></p>
  <p>In the above image it returns an 400 Error but the user gets created.
  Also, how to send the confirmation email with Strapi standard email plugin.</p>
  <p>All auth permissions for <code>Public role</code> have been enabled</p>
  <p><a href="https://i.stack.imgur.com/G8kmx.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/G8kmx.png" alt="Permissions" /></a></p>
  <p>How to fix this error and send the confirmation email on new user register?</p>