Blu-ray 3D can only be recognized as 2D can not play 3D

First of all, please make sure that your Blu-ray file contains ssif files, as only ISO files that containing ssif files or ssif.smap files can play 3D content properly. You can use tools such as WinRAR to extract the Blu-ray file.

Users can utilize software like AnyDVD, DVDFab, and MakeMKV to create ISO files with Blu-ray discs for which they own the copyright or are free to use.

Finally, during the packaging process, the ISO file may contain multiple video files. Therefore, when playing the video, you may need to switch video files to access the 3D video content you desire for your viewing experience.

Please ensure that all the actions comply with relevant copyright laws when obtaining and using any digital content, respecting intellectual property rights.