"License Expired" message appears

I deactivated my SDL Trados Studio 2021 Freelance on an old PC to activate it on a new one in August.

Since then I've had no opportunity to use Trados. Now I can't activate it on the new one with the message "Licence expired". 

On my RWS account, the license status shows " Users :1, In use: 1, Available:0".  

What should I do? Thank you.

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