Digital Signature Issues Behind QuickBooks Error 15222 Digital signature verification is critical for secure QuickBooks updates. Error 15222 occurs when this process fails, often due to browser or security software settings. QuickBooks relies on Internet Explorer for digital communication, so make sure it’s the default browser. Also, verify that your system recognizes digital certificates required by QuickBooks. Addressing these factors will help ensure successful updates without recurring errors. -- https://asquarecloudhosting.wixsite.com/howtofix/post/fix-quickbooks-error-15222-fast-payroll-update-issue-solved