title: Unable to use Hash Angular and aws cognito
body: <p>I am using angular to build my app and AWS Cognito for the access(login etc) ..
  I use the  hash (useHash=true) but I can not configure Callback URL having hash(#) in it.
  it is not allowing us to configure the URL with hash.</p>
  <p>And for this, when I launch my angular app, first I get the login page of AWS Cognito but after login, I have my page constantly refreshing and when I set the useHash= false it works.
  But I need to put useHash= true, it works fine</p>
  <p>Do you have a way to solve this problem?</p>