Upgrade from Studio 2019 to Studio 2021 not possible because of license deactivation problem

I have just upgraded my Studio 2019 to 2021 in my account and now cannot deactivate the license on my computer: "Deactivation failed. Login for this product key has been restricted. Contact the system administrator for assistance." How do I fix this? I need to deactivate the old license in order to install the new one.

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