This is still being worked upon and making good progress! Stay tuned for additional updates.
-WarrenDavid López supported this idea ·David López commented
Glad to see some of you are in some way using my Tampermonkey based script in order to alert for notifications (https://github.com/Dellos7/ms-teams-notifications-tampermonkey) until this feature is added to MS Teams Online...
This is basically a workaround that lets you at least receive notifications in the browser.
@Dominik Dünnebacke, would you mind sharing that extension?