serial number cannot be enabled.

Hi 無法啟用.jpg,

The activation failure after reinstalling Windows Server 2025 usually happens because the product key doesn’t match the edition you installed, or because you’re using an evaluation build that cannot be activated with a retail/volume license key. It means you might be using a key that isn't valid for this specific Server 2025 build (e.g., a pre-release key that has expired) or a volume license key that requires a Key Management Service (KMS) server that it can't contact on your network. You need to double‑check that the edition (Datacenter vs. Standard) matches your license, and confirm you’re not on the 180‑day evaluation ISO, which requires a fresh install with the correct media before activation will succeed.

Besides, do you have access to the Server 202 installation media? Let's try booting from it again, but this time, choose "Repair your computer" instead of "Install now." From there, run Startup Repair and check the system memory using the built-in diagnostic tool. If the system seems stable after a repair, or if you can get to a command prompt, we can tackle the activation issue with more precision. The command slmgr.vbs /dlv run from an Administrator Command Prompt is your best friend here. It will show a detailed license summary, telling us exactly what state the product is in, whether it's a volume license, retail, or what error code it's hitting. This is what we need to move forward.

I hope you find this piece of advice useful to some extent. If you're able to solve the issue based on that, it's appreciated to accept the answer as a way to share your valuable experience with the community.

Hi 凱琳 黃,

Have you found the answer useful? If everything is okay, it's really appreciated of you to share your experience with the issue by accepting the answer. Happy to help!

Vivian

Good morning,

Just want to know how it is going with your issue? Should you need more information, feel free to leave a message.

VP

Hi,

How is your issue? If you require more details or assistance, don’t hesitate to send a message. Glad to support you!

VP