now imagine a game that intercepts phone calls (because everyone totally reads the permissions sheet) and is actually able to handle 911 calls. congrats, now OP just gave an attacker their physical address, and their grandma is dead because, well, i doubt the attacker will relay the call for them.
this is a huge, huge problem and has nothing to do with Teams.
You would have thought app sandboxing on android would simply not allow this at all. 911 is just too critical to allow any app to interfere with it. The code path should be simple and uninterruptible.
Someone in another thread here said Teams itself is required by the FCC to be able to make 911 calls and that is the root of the issue. MS teams implementation clashed with the OS dialer (iiuc).
I think Teams is required to take 911 calls because it incorporates Skype for Business/Lync's PBX capabilities, which makes Teams basically an office phone like Cisco Jabber.
That makes me wonder if Teams on iOS can make 911 calls...
this is a huge, huge problem and has nothing to do with Teams.