I have the exact same issue... I reinstalled drivers, including using DDU... and the microphone (Microphone Array Intel SST) now is very soft, despite the sensitivity settings being up to 100%...
This only happened since the Windows 10 May 2020 Update (2004), as I was calibrating the microphone recently to use with Discord. Where to get updated drivers for an HP Spectre x360, late 2019 model?