Send Message parameter.
By default all new users that you create will be prompted to change their password the first time they login.
If you are using the single sign-on approach then this may not be desirable.
To stop this from happening you need to set the
SkipFirstLogin field to true.By default it is assumed that a username will be a valid email address.
If you want to use a non-email address as username you must also set the IsCustomUsername property to true.