An error occurred while saving the commentKeith Weikel commented
I have mine set to always receive notifications, regardless of whether or not the desktop client is logged in. That worked fine for awhile, but stopped in February 2020. It also appears to be constantly logged out on mobile (Android). There should be an Android persistent "notification" available as a setting (like Lync and Skype for Business had) to keep it logged in, and so that you know it's logged in.
The team has updated the default sound for Teams notifications so it is more noticeable. We are in final testing, with a goal to release the new sound by the end of this quarter.