Sony WH-1000XM3 Help Manual page 84

Note
Wear the headset under the actual usage conditions during the optimization. It is recommended that you do not touch the
headset during the optimization.
The optimization is canceled when the headset receives another operation command during the optimization.
If the NC/AMBIENT button is set as the Google Assistant button, the NC Optimizer function cannot be operated from the headset.
If the NC/AMBIENT button is set as the Amazon Alexa button, the NC Optimizer function cannot be operated from the headset.
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