QuickBooks Error 15212 is an error code that users may encounter while using QuickBooks software. This error typically occurs when there is a problem with the digital signature verification process. It can prevent users from updating or installing QuickBooks payroll updates. To resolve this issue, it is recommended to download and run the QuickBooks Install Diagnostic Tool, which can help identify and fix the underlying problem. If the error persists, contacting QuickBooks support for further assistance is advisable.