Hi Reda,
I'm Sumit, here to assist with your question.
Apologies for any inconvenience - I'm happy to help you today.
The key is in the Microsoft account associated with the machine in the past. It can be yours or any other account that you used to sign in. More details here:
I hope you find this information useful. If you have any more questions, don't hesitate to reach out. Otherwise, please take a moment to accept the answer. Wishing you good luck!