This is the one of the steps documented
Press enter then select “Start” to begin configuring your network and an administrator account. Follow the instructions on the screen, you will be asked to configure your network and enter your Ubuntu SSO credentials
When keying in email address foo@example.com, there will be pauses of more than 5 secs approximately that prevents further input, eg when you keyed in foo@exam. ple cannot be entered until some time after