Issue with offline deactivation

My Trados Studio 2021 stopped working and won't launch I reinstalled it but my license is not deactivated before the reinstall.

I tried an offline deactivation but when I pasted the Deactivation Certificate I received the following error:

An error has occurred with your offline-deactivation. If you continue to have problems, please Please log a support request.

What can I do in this case?

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