Sergeyt
Parallels Developers
... but the parallels helpers always said to the just sign out from the toolbox and login again. However, I cannot find the sign out UI in the "About parallels toolbox", same to GreggS2.
It looks like Parallels Desktop(PD) and Parallels Toolbox integration problem.
If you deactivate Parallels Desktop temporally ( do sign out as explained above ),
Parallels Toolbox should give you an opportunity to enter a key manually.
Then you can do PD sign in and activate PD as usually.

