Trados does not recognise my perpetual Trados 2021 licence after PC crash

Good morning, following a pc crash I had to reset it back to factory settings. Now I have tried to reinstall Trados but it does not recognise my perpetual Trados 2021 licence and shows that I have 28 days trial period left. I have tried to reset my license but it shows an error!
Please tell me what I can do to solve this problem!
I need Trados for work!
Thanks in advance!
Thérèse Marshall

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