Some users try to sideload the Sticky Notes app package ( .appx or .msixbundle ) from a Windows 10/11 machine. While technically possible using PowerShell ( Add-AppxPackage ), this approach has major drawbacks:

Once installed, you can find “Sticky Notes” in the Start Menu. Sign in with your Microsoft account to enable sync.

Windows Server 2019 lacks the Microsoft Store by default, which is the primary delivery mechanism for the Sticky Notes app Microsoft Learn