Hello Sim,
Since the system is already identifying as "Pro for Workstations" but rejecting the generic setup key as "invalid," and considering the "melted ice cream" server error you witnessed earlier, we are likely dealing with a synchronization failure between the Microsoft licensing servers and your local Licensing Service, or a potential edition mismatch (e.g., "N" edition vs Standard).
Perform the following steps to clear the current licensing state and attempt a force-activation via the command line, which provides more granular error codes than the Settings menu.
- Verify "N" Edition: Press Win + R, type winver, and hit Enter. Check if the edition specifically says "Windows 11 Pro for Workstations N". The "N" versions (common in Europe) require a different generic key.
If "N" is present, use this key instead: WYPNQ-8C467-V2W6J-TX4WX-WT2RQ
- The Settings menu often masks specific errors. Open Terminal (Admin) or Command Prompt (Run as Administrator) and execute the following commands in order:
slmgr /upk (Uninstalls any partial/corrupt product key).
slmgr /cpky (Clears the key from the registry).
slmgr /ipk DXG7C-N36C4-C4P73-6CMG5-4BX49 (Attempts to install the standard Workstation generic key. If you have the "N" version, use the key from step 1).
slmgr /ato (Forces an online activation attempt).
3.
If slmgr /ipk succeeds but slmgr /ato fails with error 0xC004C003 or 0xC004C008, your Digital License is not being picked up by the server (likely due to the account sync issue you saw).
If slmgr /ipk fails saying the key is invalid, your installation media might be corrupted or is an Enterprise SKU masquerading as Workstation.
- You mentioned your license is "Retail." If you purchased a boxed copy or a digital key from a third-party retailer (Amazon, BestBuy, etc.), you have a unique 25-character alphanumeric key (e.g., XXXXX-XXXXX-XXXXX-XXXXX-XXXXX). You must enter that specific key, not the generic one. The generic key is only for users whose license is purely digital (bought via Microsoft Store directly and linked solely to the email).
If the server-side "melted ice cream" error persists on the web portal, the Activation Troubleshooter on the PC will continue to fail (as it relies on that same web backend). You may need to wait 24 hours for the Microsoft account servers to stabilize before the "Hardware Change" list populates correctly.
I hope you've found something useful here. If it helps you get more insight into the issue, it's appreciated to accept the answer. Should you have more questions, feel free to leave a message. Have a nice day!