Thank you for the feedback. Changing the default setting is under review by the feature team, and your feedback is very useful as they are evaluating.
This item is still under review by the feature team. I have no details as to when a decision might happen.
As the last status states, we have been testing for several months. Although many people have asked for this feature, we received a similar amount of feedback from other users that they prefer the Teams notifications and don’t want them changed. We are currently testing a feature for users to choose between Teams notifications & Windows notifications.
We will update you as work progresses.