title: Trying to sign into Sandbox Apple ID in Settings leads to "User name or password is incorrect."
body: <p>I'm trying to add In App Purchases to my app so I set up a sandbox Apple ID with one of those myemail+test01@domain.com types of emails. I also copied the password from Notes straight into App Store Connect, so it's definitely not messed up there.</p>
  <p>I got the verification email, I verified, then I tried signing the Apple ID into the simulator using my app. I typed in the details at the point where the fields in that alert comes up, I press ok, then nothing. The box disappears and nothing comes up. I tap the button again, then the Apple ID prompt shows up again.</p>
  <p>Then I tried it in Settings by going to &quot;Sign in with your Apple ID&quot; and typed in my Apple ID &amp; password in there, and I got a message saying &quot;User name or password is incorrect.&quot;</p>
  <p>I tried setting up another sandbox account with a different password format, got that verified, then the same thing happened.</p>
  <p>How do I get this working correctly and sign in properly? I obviously need to test these things before I launch.</p>