What could be causing QuickBooks Error 15215?

An erroneous setup of Microsoft Internet Explorer is the major cause of QuickBooks Error 15215. The digital certificates on all files are normally double-checked by QuickBooks. To secure your computer and its data, these procedures are done for all downloaded programs. It's possible that the verification is incomplete, or that a problem may develop throughout the process. As a consequence, the verification may stay incomplete. It's also feasible that there will be no authentication at all. The error notice appears as a consequence of insufficient or incorrect verification.