Transfer upgrade license from account to another

Dear support team,
I have recently purchase an upgrade license for Parallels Desktop 15, since Parallels Desktop 9 was not anymore supported on Mac OS High Sierra.
Not knowing that I already had an account for the old existing license, I assigned the upgrade license to a new parallels account.
During installation, I now get the error that the two licenses are attributed to 2 different accounts. Is there a possibility to have the upgrade license transferred to the old account?
Many thanks in advance and best regards
Vincent

 

Hello, sure we will be glad to help you.
Please share with us your previous account email/or license key and your new license key.
Please send it via the private message.

 

Dear Maria, thank you for your reply. How can I send you a private message?
Can you initiate a private conversation? I did not manage to do it...

 

Please sorry my bad and reply on my PM

 

Done

 

Hello, please sorry for the delay. Your keys have been transferred to maria****era@ti***o.com