If you can’t access QuickBooks because of an expiration message, the software likely failed to validate the license. This can happen due to a lapsed subscription or software verification error. Resolve it by reviewing your account status on the Intuit site or updating your license key. Taking care of this early prevents workflow interruptions and secures your business records without further stress.

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https://www.apsense.com/article/852996-quickbooks-desktop-has-reached-the-expiration-date-a-guide.html