Windows 10: Windows 11 pro suddenly doesn't see activation key

sorry for bad englishI bought a pc with Win11Pro from a trustworthy company 2 years ago. I used the key included to activate the system and everything worked perfectly fine for these 2 years. Today while playing a game suddenly a watermark saying "Activate windows" appeard if it matters I was playing League of Legends. Again, it was activated and worked for 2 years. Worth noting that no parts were added/replaced the machine was never even opened and I have not played around with risky settings I have barely ever opened the terminal and probalby never touched the register and such on th

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Activation of Windows 10 Pro doesn´t work

Hallo, i can´t activate my windows 10 Pro (free upgrade from windows 7);

Info: 0xC0EA000A

Manual activation doesn´t work either.

Important (i think): I had to re-install windows 10 (3 or even 4 times). because I had massive problems with "Start and Cortana Issues".

I hope, I don´t have to search the old product key.

PS. Yes, Windows 7 was genuine.

 

Windows 11 Pro activation key

Thanks for reaching out! I'm an Independent Advisor and a Microsoft user like you.

Have you tried logging in with the account linked to the digital license on your device? I've provided a few steps you can try including some more you can follow:

1. Link your Microsoft account: Ensure that your Microsoft account is linked to the digital license on your device. Go to Settings > Accounts > Your info and check if your Microsoft account is listed there. If not, click "Sign in with a Microsoft account instead" to link your account.
   
2. Run the Activation Troubleshooter: Go to Settings > System > Activation, and click the "Troubleshoot" button. This will launch the Activation Troubleshooter, which can help reactivate Windows after a hardware change if your Microsoft account is linked correctly.
   
3. Enter your existing product key: If the Troubleshooter doesn't resolve the issue, try entering your existing Windows 11 Pro product key. Go to Settings > System > Activation, and click "Change product key." Enter the key you used previously to upgrade to Windows 11 Pro.
   

If you are still having issues after trying these steps, please let me know. I'll be happy to help.

 

Windows 8.1 pro + WMC key activation

This worked for me last time with a Win 8 key.

Install Windows 8.1 and enter KMS key during setup. Once in windows change product key to my Windows 8 key. Go to add features and enter my WMC add-on key. Drink a beer to a job well done.