Let me help you get rid of the TLS 1.2 error and get you back on track, @Atsuko.
To open QuickBooks without getting the error, let's perform the following steps:
- Open IE 11.0.21 (KB4074736).
- Go to the Settings and choose Internet Options.
- Click Advanced and select Security.
- Uncheck TLS 1.0, 1.1, and ensure that TLS 1.2 has a checkmark.
I've also added this link to learn more about TLS 1.2: TLS 1.2 for QuickBooks Desktop for Windows.
Just in case you need help in troubleshooting QuickBooks Desktop and Internet Explorer, take time to read this article: Verify and Troubleshoot QuickBooks Desktop and Internet Explorer settings.
Let me know how it goes in the comment section. I'll be here to keep helping. Have a wonderful day.