Microsoft does not issue specific "Insider-only" activation keys. Instead, the Insider Preview uses the same activation infrastructure as the retail version of Windows 11. Activate Windows - Microsoft Support
If your machine was previously activated with a genuine Windows 10 or 11 Pro license, that "digital footprint" is stored on Microsoft’s servers. When you join the Insider Program and install a Preview build, Windows recognizes your hardware and account, automatically activating the Pro version. 2. Joining the Insider Program Properly windows 11 pro insider preview activation key
Microsoft does not sell or distribute specialized "Insider keys." You use standard Windows 11 Pro keys for activation. Unactivated Use: Windows recognizes your hardware and account
Microsoft does not typically provide separate, standalone activation keys specifically for Insider Preview builds. Digital Licenses: windows 11 pro insider preview activation key