Yamaha TW-E3C True Wireless Earbuds (Red) - Manual (Page 41)

Multi-point connection unavailable
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This product may already be connected to two Bluetooth devices.
You can connect to up to two Bluetooth devices that support multi-point connection at the same time.
When connecting a third Bluetooth device, disconnect one of the previously connected Bluetooth
devices.
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“Connecting to two Bluetooth devices at the same time (multi-point connection)” (p.24)
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The product is not pairing correctly.
If the information for this product still remains in the list of connected devices on your Bluetooth device,
delete that information and try pairing again.
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“Pairing with a Different Device” (p.21)
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“Connecting to two Bluetooth devices at the same time (multi-point connection)” (p.24)
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Troubleshooting > Multi-point connection unavailable