license error: "Unable to perform the operation. the license server rejects it"

I have an active permanent license of Parallels Desktop for Mac.
However, today I faced this error when trying to open parallels: "Unable to perform the operation. the license server rejects it".
How can I solve the problem?

 

Hey, please try this KB article and let us know how it works

 

Thanks for your attention.
The same problem persists when trying to add the code in business edition.

 

by the way, my account is home edition (not business)

 

Kindly let me know whether I should expect an answer

 

Reminding

 

Hi, please provide me with your key via the private message, I'll check it for you.