Two possibilities:
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Make sure you have the ANT+ libraries installed on the phone. I’m doubtful this is the issue as you’re not seeing anything via ANT+ or BLE.
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Strong suspicion: you still have another device or app attempting to steal control of the sensors. 99% of the time, this is the issue that leads to the symptoms you’re seeing.
See this very tongue in cheek thread: Pssst: Yes, you do have another device connected, dummy