Sure, but not at all in this case. My understanding is that emergency calls for any global locale are supposed to be an entirely separate band of communication

Sure, but not at all in this case. My understanding is that emergency calls for any global locale are supposed to be an entirely separate band of communication from regular phone calls — e.g., they must work even without a SIM card, an account, etc. So, emergency calls should be ENTIRELY OUT OF SCOPE FOR ANY APP software. Period. It should be a low-level override/bypass, and NO app software software should ever be allowed to even touch emergency calls, let alone required to handle them. Expecting all apps to handle life-critical emergency calls correctly is a profoundly stupid idea, guaranteed to produce a multiplicity of failures (and if that expectation did exist, Google must damn well announce it as a deadly serious requirement in bold, uppercase, red flashing letters to anyone wanting to use phone_call_handling permissions, but they don't, afaik). So, we don't need to know anything about Teams or other app software in this case, only about the emergency calls side/back channel, and that any app, including Teams, will ZERO responsibility for handling emergency calls, or even ability to touch them. So, it is Google that effed up big time here (regardless of Teams' other issues). Unless you make a solid case for the profoundly stupid idea that all phone-related app software should be responsible for handling life-critical emergency calls, your statement is plainly wrong.