I am using Microsoft Launcher on a Nokia 9 Pureview. I have noticed the following bug/issue:
Enabling 'Microsoft Launcher' as the default 'Assist & voice input' permanently disables the main/forward facing microphone on my phone!!
* Android 9, Security patch 01/08/2019, Build number 00WW_4_27D
* Microsoft Launcher v18.104.22.168040
The only way I can resolve this issue is to hard reset my phone :(