APM response - 500 Invalid request code

This error means license can't be verified due to:

  • internet connection abruptly stopped during activation or it's not possible to establish secure https session.
    Please try to activate again
  • you're behind some router which requires authorization and redirects to some login web page.
    Please try to open any site in a mobile browser first
  • Poweramp APK is not genuine (hacked, moded).
    Please download and install Poweramp APK from https://powerampapp.com