With our 2023,1 Preview 2 release, we were made aware that certain RTX GPUs that should be able to run Path Tracer are unable to do so. Our developers are currently looking for a solution to this issue.
If you could please submit a bug report here and attach a copy of your Twinmotion.log files (Where to find Twinmotion .log file), this will help our developers better understand the issue and more quickly find a resolution.