V.a. doesn't catch a meeting on MS Teams

[Cleversn]

When I enter into a meeting on Microsoft Teams and press windows+NVDA+up/down, volume adjustment doesn't change the volume of the speeches comming from the meeting members as expected. In addition, even after I use windows+NVDA+left/right to locate MS Teams in the applications list, the meeting volume is not changed when I press up/down. Interestingly, I am able to locate and change it in the standard Windows mixer (SNDVol.exe).