Due to an Oculus update some Quest 2 headsets experiences sounds issues, to circumvent the problem follow these simple steps before you launch MeetinVR on the Quest 2:
Click on the three vertical dots on the bottom right side of the MeetinVR app icon.
Click permissions.
On the list of permissions for MeetinVR, select Microphone.
Set the permission to Deny
Launch MeetinVR as usual and allow the microphone permission again.