Why isn’t the Lock Screen wallpaper working?
Make sure Lock Screen is enabled in Wallper settings and try setting a wallpaper again.
Lock Screen wallpapers require macOS 26 or newer. First, open Wallper Settings and enable “Use Lock Screen & Screensaver”. Then set any wallpaper again — this usually triggers the system integration.
If you don’t see Wallper in System Settings → Wallpaper, repeat the steps above. The Wallper section will appear automatically after the first successful setup.
For a full step-by-step guide, visit: https://www.wallper.app/support/lockscreen