When connecting the devices with allsync, not all devices are shown in connected users.
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Laptop connected to Allsync
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iPhone X connected with AirPlay
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Google Pixel connected with ScreenCast
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OnePlus Nord2 connected with Allsync
This is not a bug, it is by design that third-party protocols are not listed in the list of connected users due to structural limitations of Airplay and Google Cast.