I cannot deactivate SDL Trados Studio 2021 licence (online and offline)

I need to reinstall Windows in my PC and I am unable to deactivate SDL Trados Studio 2021 licence neither online nor offline. 

The message I get when I try to dactivate the licence (online way) is on this file attached.

Can you please help me to solve the problem?

Thanks in advance.

Macarena.

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