I just purchased a license for my client (A-S00022006), but I can’t active.it..
Can someone check it out?
Any chance you’ve already contacted support, too?
If there hasn’t been a solution yet, via a ticket response for example:
This error message Indicates that a date rollback was detected. This happens when the current date on the machine is earlier than the date on which the license is generated.
Please tell the customer to adjust the date accordingly, to the correct value, in Windows. 
Afterward the license should be activate-able.