Additional team and channel-related features and issues within Microsoft Teams for Education
My laptop is also a Dell.
If I am ever a CIO and some procurement manager says, "let's buy Dell laptops," I'll fire his **** right there.
This is whacky but what I have found in my ongoing adventure with this feature is that before a Teams meeting begins, I have to unplug my laptop from any external monitors before I plug the headset into the jack and then it's typically OK for mic input levels.