Microsoft does publish generic for every Windows edition. For Windows 11 Pro, that key is:
Once you have an activation key, follow these steps to activate Windows 11 Pro Insider Preview: windows 11 pro insider preview activation key
If you are building a test machine with no prior Windows license, Microsoft allows unactivated use of the Insider Preview indefinitely. You will see a watermark (“Windows 11 Pro Insider Preview – Evaluation copy”) and limited personalization options, but (Hyper-V, BitLocker, Remote Desktop). Microsoft uses the Insider Program primarily to gather telemetry, not to enforce activation strictly. Microsoft does publish generic for every Windows edition
This program serves two purposes:
Scam websites often repackage this publicly available Microsoft key as an “Insider Preview activation key” to trick users into downloading malware or paying for free information. windows 11 pro insider preview activation key