Things to check:
- Make sure that the processing of your IFC file is completed successfully in the Tridify BIM Publishing Service.
- Check your Tridify BIM Tools version to see if it needs to be updated. You can find the version number in Unity Menu: Tools > Tridify > About Tridify BIM Tools. It should be the same as in https://www.tridify.com/developer-tools/unity/
How to make sure I have the latest version of Tridify BIM Tools in my Unity project?