As of 24 August 2021, neither microphone nor speakers work reliably with MS Teams on our Linux Mint 20.1 desktop.
No other software (e.g. Zoom, TeamViewer etc) ever had any issues. This is clearly a bug in Microsoft Teams software for Linux. There is no reason why MS Teams software can't use the native Linux drivers for this, like Zoom and others.
Using the following Audio Adapters:
HDA-Intel - HDS Intel PCH
USB-Audio - Samson Go Mic