Re-activating my licence

Hello,
I've encountered a problem with my Windows 11 and had to reinstall it. I had not deactivated my licence beforehand.
As a result, I had to reinstall all applications, including Trados Studio 2021, again.
However, now I am unable to activate it, as the activation code is already in use.
How can I de-activate and re-activate my licence?

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