Cause 1: Either the TC417 or the 2nd headphone did NOT enter PAIRING MODE.
Solution: Ensure BOTH the TC417 and the 2nd headphone enter PAIRING MODE.
Cause 2: Either the TC417 is already connected to TWO devices, or the 2nd headphone is connected to other unwanted Bluetooth device.
Solution: Clear paired history of BOTH the TC417 and the 2nd headphone, then pair them again.
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