The product key of a previous version of Parallels Desktop has been not accepted on the license serv

I just have bought a update version from parallels desktop 12 to 13 as suggested in my software but when i will put the key i have received the message "you have entered an upgraded key. Please confirm it with the key from the previous version" requeste my previous key that I put and receive always the message "The product key of a previous version of Parallels Desktop has been not accepted on the license server". How can I validate it?

 

Hello, we have sent you a private message. Kindly help us with our license key over there to resolve the issue. Thanks.

 

We have reset your Parallels Desktop for Mac license key, please try to activate it now. Thanks.