There appears to be a bug in Toolbox 2.0 that caused this issue for some of the users, but I can reassure you it's not an intended behavior. The team is currently investigating the problem and we will provide solution as soon as we have one. We apologize for this inconvenience.
We would also request your help in resolving this issue. If you are experiencing activation problem after updating to Toolbox 2.0, please submit a technical report from within Parallels Toolbox, by going to "gear" icon->Help-> Send Technical Data. Share your Problem Report ID here. Thank you for your help and understanding.
Last edited: Aug 23, 2017