Samsung Devices with the default Email app.
The following error occurs gets when trying to set up email in the Knox Workspace: 'Try again with network provider's default APN'
This issue occurs when the Email app cannot connect to the EAS activation server https://api.samsungapps.com/activesync/activate/activesync.
This is due to a settings issue with the Firewall, VPN or the Proxy server. Please check these settings and the issue should be resolved.