Security exception while customizing google setupwizard in Oreo

Custom setupwizard + google setupwizard -> homescreen

• Referred GmsSampleIntegration
• Written a separate custom setup wizard application(apk)
• Custom setupwizard is launching successfully
• While launching google setupwizard after custom setupwizard facing below: Unable to resume activity {com.google.android.setupwizard/com.google.android.setupwizard.network.NetworkActivity}: java.lang.SecurityException: NetworkScoreService: Neither user 10037 nor current process has android.permission.REQUEST_NETWORK_SCORES.

Observation :

REQUEST_NETWORK_SCORES is a signature level permission

• Tried below mentioned options :
  • Placed custom setupwizard as priv-app
  • Used android.uid.system in manifestfile
  • Declared REQUEST_NETWORK_SCORES in manifest
  • category SETUP_WIZARD in manifest
  • action DEVICE_INITIALIZATION_WIZARD in manifest

In one of wizard script it was pointing to google package, I changed to custom setupwizard package. No security exception found after that.