The vendor has published 2 unique mention(s) for this bug: 1. Profile Management might fail to register its Winlogon notification during installation when the existing notification registry value is large. As a result, user profiles are not processed and local profiles are created instead of managed profiles. [UPM-12152] 2. Winlogon notification registration might fail when the existing notification registry value exceeds the fixed buffer size that Profile Management uses. Latest urls for this bug: 1. https://docs.citrix.com/us/en/profile-management/2507-ltsr/whats-new/cumulative-update-2/fixed-issues.html 2. https://docs.citrix.com/us/en/profile-management/2607-ltsr/whats-new/fixed-issues.html