Activation requested after not transfering the license; product key connected to another account?

Hallo,
I have a strange issue here. When I started my parallels session a few minutes ago it says that I have to activate the product (which I bought and activated a few weeks ago).
After trying by entering the product key I got the message that the product key is already active on another Mac and connected to another account.
I didn't try to transfer the license or something like that.

Parallels just worked fine like ten hours ago, but now it's not possible to enter the application.
Please help!

 

Problem solved. Please close.

 

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how it was solved ?

 

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