I can't reset my licence

I bought a licence with 2 activations. I only activated once in one computer. Then I had to have my computer repaired but couldn't deactivate it. Now I want to intall Trados again but I have noticed that I only have 1 activation available even though none of them is in use (in licence in use it says 0). How can I reset my licence to get the 2 activations again?

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