Can not get Qt 6.8 object properties

There is currently no functioning support for QT in the latest release of TestComplete, none of the information here will solve the issue. Smartbear needs to provide a fix. This was broken in the 15.72 release and has not been fixed since.  Please report this to support as many times as necessary to get them to understand that it currently doesn't work.

I'm sure you are aware of the discussion in post QT - Error No such interface supported | SmartBear Community as you seem to have used their screenshot!

Along with what rraghvani mentioned, you might want to check a few key points:

1. Qt Plugin – Verify that the Qt plugin is enabled in File → Install Extensions → Desktop → Qt.
2. Build Configuration – Make sure your application was built with Qt meta-object information (MOC) and debug symbols included — otherwise TestComplete can’t access object properties.
3. Custom Controls – If you’re using custom Qt widgets, add them manually under Tools → Options → Engines → Qt → Object Mapping.
4. Version Support – Confirm you’re on TestComplete 15.67 or later, which includes official support for Qt 6.8.

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I'm not sure what version of TestComplete you are using, but the latest version supports Qt LTS version 5.15, 6.2, 6.7 and 6.8 as mentioned in Testing Qt Applications - Overview. A list of supported controls are mentioned in Support for Qt Applications' Controls. You can find more information in Testing Qt Applications. 

Otherwise open a ticket via SmartAssist or Open Case via TestComplete Support Center