The QuickBooks TLS 1.2 error can be resolved by ensuring a set of security protocols supported by the operating system. TLS 1.2 should remain enabled for secure communication for QuickBooks and online services. The first step in resolving QuickBooks TLS 1.2 Error is to check whether the operating system and browser are up to date. Then update QuickBooks to its latest version and enable TLS 1.2 in the Internet settings if necessary. Ensure that the security certificates on the computer are up-to-date to avert any compatibility issues. The resolution may also call for configuring the firewall or antivirus programs, which may be blocking a secure connection. Following these steps will allow you to clear the QuickBooks TLS 1.2 error, thereby enabling secure interaction with QuickBooks services and seamless functionality.