Hi there,
You cannot use the App to connect to more than one device .
It allows Windows 10 users to cast their Android phone to their PC wirelessly. The app only works on modern PCs supporting Miracast, a wireless technology that’s now supported on many smart TVs or streaming sticks.
You can get more info for the API from here https://learn.microsoft.com/en-us/cloud-app-security/enable-instant-visibility-protection-and-governance-actions-for-your-apps
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