It was a Windows licence based on a previous Windows 7 licence. Since I was not able to activate Windows with a product key, I just have to activate Windows using another device. Now, it's activated!
"Unable to activate Windows" error
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Anonymous
I am having a problem when activating Windows on this Toshiba Satellite L550. I typed in the product key and I clicked "Activate". It just took some time and it went into an error. It says "Unable to activate Windows, We can't activate Windows on this device because you don't have a valid digital licence or product key. If you think you do have a valid licence or key, select Troubleshoot below. (0x803fa067)."
How to activate Windows again on this computer?
Windows for home | Windows 10 | Licensing and activation
Locked Question. This question was migrated from the Microsoft Support Community. You can vote on whether it's helpful, but you can't add comments or replies or follow the question.
Answer accepted by question author
Anonymous
3 additional answers
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DaveM121 891.1K Reputation points Independent Advisor2024-06-20T15:54:06+00:00 That is great news, I am glad this is resolved, well done!
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DaveM121 891.1K Reputation points Independent Advisor
2024-06-20T15:08:32+00:00 Hi, I am Dave, I will help you with this.
Where did you get your Windows licence was that pre-installed on the laptop or did you purchase a full retail Windows licence from Microsoft or from a 3rd party retailer?
Or is your Windows licence based on a previous Windows 7 or 8 licence?
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Neil D 33,495 Reputation points Volunteer Moderator2024-06-20T15:08:06+00:00 Where did the licence originate what has changed that has prompted you to enter the key again.
Is the key a generic one listed here
Generic Product Keys to Install Windows 10 Editions | Tutorials (tenforums.com) these cannot be used to activate.