Can't deactivate licsense offline - Trados Studio 2021

I have just bought a new deskop and I am trying to deactivate my license on the old computer in order to activate on the new one.

I have a Deactivation authorization but when I paste it in Trados to generate a Deactivation certificate, it doesn't seem to get recognised and I got the following error message: "Failed to deactivate offline. The specified deactivation authorization may not be valid. Validate your deactivation authorization against the authorization in your account"

Several attempt and everytime the same result.

Can someone please help?

Trados Studio 2021, Freelancer Plus installed on Desktop and Laptop. Would like to deactivate on Desktop to installand activate on new Desktop

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