title: Testflight application/IPA installation asking for passcode
body: <p>I am new to TestFlight. I built my IPA and distributed it with TestFlight. Most of my beta testers were able to install it with no issues <em>but</em> a few have reported that they are prompted with the passcode entry screen - This does not look like a 4 digit code screen that iPhone pops up for the usual security. Please provide some guidance on what is happening - </p>
  
  <p>I think it has nothing to do with TF but just want to validate it.</p>
  
  <p>Thanks in advance.
  R.S.</p>