QuickBooks TLS 1.2 change was implemented a while back in the software. From time to time, it causes errors that could come up if your Internet Explorer browser is not correctly configured. You will have to optimize the settings within the web browser in order to fix this error. If you would like professional help with fixing this error, please contact the QuickBooks Support Number. It will connect you to a team of expert advisors who will resolve all your QuickBooks related errors within the most affordable prices.

https://www.qasolved.com/what-is-the-tls-1-2-update-for-quickbooks-desktop/