title: Can't verify my domain for Apple Pay implementation
body: <p>I'm trying to complete the domain verification step in order to test Apple Pay on the web.
  I've downloaded the file, located it in the required folder and checked that I'm able to reach it and see the contents. 
  When I click ok/verify I receive: <br></p>
  
  <blockquote>
    <p>Verification failed for domain <br>
    Unable to establish a secure connection to '<a href="https://my.domain/.well-known/apple-developer-merchantid-domain-association" rel="nofollow">https://my.domain/.well-known/apple-developer-merchantid-domain-association</a>'.</p>
  </blockquote>
  
  <p>If I open the browser console I see:</p>
  
  <blockquote>
    <p>Failed to load resource: the server responded with a status of 421 ()
    <a href="https://developer.apple.com/services-account/QH65B2/account/ios/identifiers/verifyDomain?content-type=text/x-url-arguments&amp;accept=application/json&amp;requestId=0544f9b2-3cfd-43e3-yd86-fbfb1b3f6613&amp;userLocale=en_US&amp;teamId=AYTGDKG3D8" rel="nofollow">https://developer.apple.com/services-account/QH65B2/account/ios/identifiers/verifyDomain?content-type=text/x-url-arguments&amp;accept=application/json&amp;requestId=0544f9b2-3cfd-43e3-yd86-fbfb1b3f6613&amp;userLocale=en_US&amp;teamId=AYTGDKG3D8</a></p>
  </blockquote>
  
  <p>What could be the problem?</p>