Cannot desactivate Studio 2019

Hi,

I bought an update to Studio 2021, but unfortunately I can't desactivate my Studio 2019 licence (error message : Deactivation has failed. Login for this product key has been restricted. Contact the system administration for assistance).

I tried to reset my licence, but I can't even do that (the option "Reset Licence" is missing).

Can you help me please ?

Thank you for your help

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