Hello Preetam,
This is an Internet Explorer limitation. As IE is an older browser, it cannot handle specific javascript as well as newer browsers. So you could tackle this in two ways:
1. Remove any custom javascript that you may have that isn't supported with IE
2. Upgrade your Outlook and Windows versions to the below:
App for Outlook uses Microsoft Edge browser when you are using Windows 10 (version 1903 or later) OS and Outlook Click-2-Run client that’s updated to the current channel, Monthly Enterprise channel, or Semi-annual Enterprise channel (16.0.13127.20508 or later). For other combination of Windows and Outlook, App for Outlook uses Microsoft Internet Explorer browser.
If you upgrade outlook and windows to the above versions, then the app for outlook will leverage Edge Browser instead of ie.
Thanks,
Tyson