If it was possible to make a call from a PowerApps-App to a Teams user (based on tenant-id, user-id, etc.), I think it would pave the way for some powerfull applications. As it sits now, the Teams connector seems lacking considering all the functionalities in Teams that could be useful in a PowerApp. Access to media, like microphone and camera, is already possible in PowerApps, so I don't see any reason to not include it. There is also Graph API permissions for making (phone) calls to Teams, which suggests that it would be possible to make it work.
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