OAuth2 Entra ID login redirects back to home page without logging in after the first successful login. Re-creating the user in osTicket fixes it temporarily.

This is likely a duplicate or stale user record in the database, or a Guest User session issue. Do not delete and recreate the user -- instead clear all browser cache/cookies/sessions completely and try a fresh private browser session. Check the database for duplicate user entries with the same email. Review all logs during a failed login attempt (PHP error log, Apache error log, osTicket system logs, browser console) to identify where the authentication pipeline drops the session after successful Entra ID authentication.