The demo on the drift site fails with uBlock Origin installed and Annoyances filters enabled but otherwise it works.

Does it still happen in Troubleshoot Mode?

Yes, The issue is still there in Troubleshoot Mode

It works in a normal non-private window? Can you share an example site?

Does it still happen in a new profile? An easy way to test a new profile is to install Developer Edition and see if it happens there or refresh your existing profile.

Yes, It works fine on non-private window . Here's a site link: https://www.egnyte.com/ Click on "Get Demo" Button on the navigation bar

It works for me with Tracking Protection disabled. Private windows block tracking content by default.

"Get a Demo" Drift box is working on https://www.drift.com/, without Tracking Protection disabled. Why this issue occurs on https://www.egnyte.com/ ?

Can we do something from our codebase and fix this issue?

The tracking list is supplied by Disconnect, you can submit an appeal using the form at the bottom of their website:

https://disconnect.me/trackerprotection