Internet Explorer is old and doesn't support websites that use too-new features. Some alternatives are listed below.
Microsoft Edge supported Operating Systems lists Microsoft Edge version 109 as the last version to support Windows 7.
The Chromium-based Brave browser last version to support Windows 7 seems to be Release v1.46.144 (Chromium 108.0.5359.128)
Firefox users on Windows 7, 8 and 8.1 moving to Extended Support Release lists Firefox version 115 as the last version to support Windows 7. See Index of /pub/firefox/releases/.
EDIT : Finally the problem wasn't with the browser but with the installed root certificates. Updating the Root Certificates fixed the problem.