Deactivate Trados 2021 from a computer no longer in use and not accessible

Good afternoon, I had Trados 2021 with licence 

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on a different computer which I had to reset completely, erasing all data. I would like to deactivate my Trados 2021 licence from that computer and reactivate it on the new computer where I have downloaded the software. I received a ticket to deactive it offline but I don't know how to use it. Can you please help me?

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