This method works only on endpoint devices with IGEL OS 11.

To register IGEL OS 12 devices via an E-mail address, use the Onboarding Service. For details, see Onboarding IGEL OS 12 Devices.

You can simplify the entry of the ICG server address for your users with a simple DNS tweak.

Add a TXT record for the host igel-cloud-gateway with the content https://[ICG IP address]:8443/usg/endpoint
When users enter their email address user@example.com as the server address in the ICG Agent Setup, the setup will look up this record on the example.com nameserver and find the gateway address to connect to.