Forgot to deactivate iMac

I sold my iMac and forgot to deactivate it. When trying to activate it on my Mac mini, I got a message that the license code has been used (I also have a MacBook Air, so I have two devices).

How can I resolve this? I’ve already sent a message to service@marginnote.com.

Thanks!

I really need help on this matter, because my trial is about to expire.

Hello, don’t worry. We will handle your email as soon as possible.