When debugging with MITAI2Companion on a mobile phone, it can make sounds. However, when it is packaged as an APK and installed on a mobile phone, there is no sound. All permission issues have been ruled out. All possible methods have been tried, but none of them work. The AI companion and the phone where the APK is installed are the same phone.
Which device and Android version are you using for your tests?
It would really help if you provided a screenshot of your relevant blocks, so we can see what you are trying to do, and where the problem may be.
To get an image of your blocks, right click in the Blocks Editor and select "Download Blocks as Image". You might want to use an image editor to crop etc. if required. Then post it here in the community.
Taifun
Trying to push the limits! Snippets, Tutorials and Extensions from Pura Vida Apps by 
Taifun.