Offhand it saved the new user without the error. That is fixed now. Thanks.
Just trying to get the emails sorted. I just have to figure out which one of the settings for the new user must be set to off so that the emails are sent.
Managed to figure it out. Since I do not use front end registration but register learners in the backend, I use Allow registration as "Same as CMS "allow registration" which is not published. Save with CB Registration.
Have set up the Welcome Email subject as "Account Details" set the user to reset the password on login. The Auto welcome email is also set up and that is also sent when the account is created by the admin. That is sent with details that they must complete once logged in.
Think after the last build the issue is now resolved.