Problem with audio input in Android device (Galaxy S10)

Thanks for the video! Yes, I agree with you, It doesn’t seem like your device’s issue if you can get other recording apps working properly.

In your Unity project, could you please try ticking Enable API Error Logging, setting Logging Level to Log within your FMOD Settings? (FMOD => Editor Settings),
Would it be possible for you to share a Log file saved to a text file from your device while running the mono recording project? It would help us to pinpoint the issue if you could upload it to your profiler.