"SKErrorDomain 0" Error When Upgrading to Strongbox Pro

This error is usually shown in Strongbox due to a temporary problem with the App Store or a network or firewall issue.

There are a few things that you can try:

  1. Restart your device
  2. Logout and then back in to the App Store app

Also, we would recommend changing your network from Wi-Fi to cellular or vice versa or choosing a different Wi-Fi network to see if that helps.

Jan 5, 2024