Hi 陈剑锋,
Thanks for using Microsoft Q & A Platform.
Just wanted to check if the response provided by Erland Sommarskog was helpful. As mentioned, the SQL Server installation media is usually pre-pidded, which means the product key is already embedded and not displayed separately. You can refer to the following Microsoft resources for more details:
https://learn.microsoft.com/en-us/answers/questions/1666773/product-key
If the key isn’t visible in your portal or setup flow, it’s recommended to verify your entitlement with your licensing administrator or contact Microsoft Licensing Support for assistance.
Hope this helps. Please reach out for further assistance.
Thank you.