Hi there, Alex751.

I'd suggest getting in touch with our Phone Support Team so they can provide a validation code to activate QuickBooks Desktop. You can follow the steps provided by m colleague on how to contact us. Articles were also attached for your future reference. To ensure that we attend to your concern immediately, you can check out our support hours and types. 

The Community is available 24/7. Mention me in your reply if you have other questions in mind. You take care!