A common real-world scenario where this error appears is (an open-source CRM). When a user self-registers via the index.php?module=Users&action=Register , an activation email is sent. Error 001522 appears if:
Registration broken – Error 001522 on link activation registrationactivation error 001522 link
Corrupted or outdated licensing information stored in hidden system folders can trigger a repetitive activation loop. How to Fix Registration-Activation Error 0015 A common real-world scenario where this error appears