Unable to activate older version of Parallels Desktop

Same issue. Parallels 9 on Lion. I get the activation code to email to get confirmation code but email bounces back and online activation doesn't work. Tried all steps above. Help would be appreciated. I also have the current version on another Mac so support for the many licences I have purchased would be appreciated.

 

I am just now trying to activate my legacy license and it says that it cannot be used to activate and its says that the key is still registered, when I tried to register it. It is for Parallels 11.

 

Hi I am also having the same issue. Can't sign into parallels desktop 11 on MacOS 10.13.6 High Sierra. Thanks for any you can give.

 

Same problem. Can't activate Parallels 11 with licence. Error message is "Unable to perform the operation. Please check the Internet connection and try again." Please help!

 

Hi,
Thank you for your reply, but I haven't received the instructions yet, would you mind send it to me again, Thanks a lot!

 

Hi,
It works, you save me, Thank you very much!