Why Display Names and Email Addresses Are Not Username Substitutes

Why Display Names and Email Addresses Are Not Username Substitutes is a deliberate QCUI 1.0.03 behavior that protects administrator access, target-account safety, or the integrity of the one-time impersonation handoff.

What QCUI looks up

The administrator popup sends a single Username field. QCUI trims that text and asks Joomla’s user factory to load the user by username. It does not search display names or email addresses.

Why this avoids ambiguity

Display names are not required to be unique and email presentation can vary by site policy. Requiring the exact Joomla username gives the handoff one deterministic target and avoids presenting a broad user-search interface in every administrator page.

If you do not know the username

Open Joomla Users → Manage, locate the account using normal administrator tools, then copy the exact Username into QCUI.

Operational context

For Why Display Names and Email Addresses Are Not Username Substitutes, remember that QCUI has no separate component dashboard or remote authorization service. The System plugin owns the launcher/handoff/banner behavior locally inside Joomla. If what you see differs from these instructions, verify the installed plugin version and active Joomla template/session configuration before assuming another QCUI screen or service exists.

Community Discussion

Want to compare support workflows, share practical tips, or discuss how you use this QCUI feature? Visit the QC User Impersonation Community. For private support, bug reports, account-specific issues, or feature requests, use the QuantaCade support system.