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Buy now & saveIt's indeed important that license number is activated and registered in order to effectively manage your business operations with QuickBooks, @TTAG.
To double check the validity of your validation code, it's best to contact our Customer Support Team and provide them with the license number so they can pull up your account in the system. They can use their tools to check if your validation code is valid or not.
Please know that the phone support may be limited due to volume. You can also check this article for the availability of our representatives: Contact QuickBooks Desktop support.
Additionally, if you're having a specific error while updating your account, refer to this article for a complete guide: Fix activation, license, and product numbers issues in QBDT.
To get more information about organizing your QuickBooks account, you can always visit this article as your reference: Help articles.
I encourage you to comment below if you have questions about managing your QuickBooks licenses or other concerns in QBDT. I am here to support you at every step.