https://social.emucafe.org/naferrell/microphone-struggles-with-teams-on-brave-10-09-25/
I had a Microsoft Teams call with my boss. I run Teams in Brave on my Linux workstation. My sound set-up is two Creative Pebble Pro speakers, with the left speaker having 3.5 mm jacks for a headset and microphone. For whatever reason, he could not hear me through my mic (a small MOVO brand mic with a 3.5 mm jack that I purchased on Amazon). I was unsure what the issue was. Then it occurred to me that it could be a permission issue. Sure enough, Brave was set to deny microphone access to Teams. I changed that toggle to allow and then it worked. I am now a conference call genius.