Can I use an email address for more than one account?

By
Deprecated: get_author_name is deprecated since version 2.8.0! Use get_the_author_meta('display_name') instead. in /var/www/html/succeedin/wp-includes/functions.php on line 4862
Jonathan Moore

No, with any kind of user (Office Admin, Lesson Planner, Coach, School, and Teacher) only single email address can be used.