The previous activation key has not been accepted by the license server

I purchased an upgrade license from V12 (2017) to V20 (10/2024) (V20 was the upgrade license). It takes V20 upgrade and asks for the previous version which was V12. I enter the V12 key and get this error .... "The previous activation key has not been accepted by the license server." I don't want to have to buy another license, lease help.
 
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I purchased an upgrade license from V12 (2017) to V20 (10/2024) (V20 was the upgrade license). It takes V20 upgrade and asks for the previous version which was V12. I enter the V12 key and get this error .... "The previous activation key has not been accepted by the license server." I don't want to have to buy another license, lease help.
Hello @ScottyM2
Thank you for your feedback.
We made the necessary changes on our side.
Please retry the activation of your PD20 upgrade key and confirm it with your PD12 key.
Thanks!
 
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