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Anywhere the plugin named a person it could show their email instead — "Managed by [email protected]" in the students table, the same under Booked by, instructor names on the class pages. WordPress defaults a new account's `nickname` to its `user_login`, and signup uses the email address as the login. So every self-registered account carried its own address as its nickname, and UserName::format() fell straight through to it. The name they typed was in `display_name` all along. Accounts created by a guardian were never affected — GuardianService::createChild() sets `nickname` outright, which is exactly why children read correctly and their parents did not. UserName::format() now walks nickname then display name, skipping either when it is really the login or the email, so existing accounts read correctly with nothing to migrate. An identifier still never reaches the screen: an account with nothing but its address on file falls back to the id, as before. Signup also sets `nickname` at insert, so new accounts are right at the source rather than relying on the fallback. Tests: composer test (866), composer lint, composer cs all pass. Co-Authored-By: Claude Opus 5 <[email protected]>