I received the message "License expired. Activate"

Today, when I opened my SDL Trados 2021 (SDL Trados Studio 2021 Freelance), for which I have a perpetual license, I received the message "License expired. Activate".
When I enter my activation code, I receive the message "Could not activate this license. No licenses are currently available for the specified activation code".

Why am I having this problem? It has never happened to me in three years. And how can I solve it?

Thank you

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