I appreciate your effort in contacting our Customer Support team to get a validation code, @Melis242. Let me clarify things for you.
All QuickBooks Desktop versions and support (QBDT) have already been discontinued in the UK version. Thus, we're unable to provide a validation code to complete your registration.
Meanwhile, you may consider migrating to QuickBooks Online (QBO) UK using a free trial. You can access it through this link: QuickBooks UK Plans & Pricing. You can enable the free trial subscription from there and manage your account for 1 month.
You can read through this article from the Move to QuickBooks Online section to better understand the process: QuickBooks Desktop discontinuation support
If you're about to convert your company file to QBO, you may notice differences in how your books appear. I recommend reading this article for details: Find out how your books will move from QuickBooks Desktop to QuickBooks Online
Lastly, you can visit this article for more details and tips when performing new tasks in your QBO account: Get started with QuickBooks Online.
I'll make sure to come back if you have additional questions regarding your validation code or any other QuickBooks concerns. Simply click the reply button below and I'll provide the necessary assistance.
