I can't reactivate parallels for Mac

I want to reactivate on a new Mac, but failed(use another account), before do that, I had deactivate on the old Mac.
now, I also can't reactivate on the old Mac.
And I couldn't find anyone to support, only bot supply no-use information.

 

Hello baiqian, please let us know the error message you are getting while activating the license key on the new Mac. Thanks.

 

I had send the screen shot.

 

Here is the error message

 

Hello, we have sent you a private message. Kindly help us with both our license keys over there.

 

Hello, we appreciate your response.