This feature team has been aware of this request, and it is under review.
An error occurred while saving the commentSaddat Sarfraz commented
I believe only Application flash is fine whenever there is a new message. I don't want to see a pop-up notification every time I receive a message. Sometimes its very distracting and annoying. We use Teams at work and so many people are messaging in Channels or sending chats. I want to keep the application flash on and pop-up gone.