With Trados Studio 2021 Freelance Plus I cannot activate on my second computer, please help

Recently I purchased new PC so I downloaded Trados Studio 2021 SR2 from "Download" section of my account and installed it on my new PC. Now, I tried to activate it but encountered the error saying, "Could not activate this license. - No licenses are currently available for the specified actuation code". 

I have SDL Trados Studio 2021 Freelance Plus, so I understand that I can activate the second on my new machine other than my current machine.

Could you please help me here?

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