How do I set up parental controls to lock a channel?
Press Quick settings > Navigation keys up > Channel > Parental Controls and press OK, then select Channel Blocked and press OK. Use the Navigation keys to select the channel you want to lock or unlock, and press OK to confirm. A locked channel will be marked with a lock icon, and a 4-digit PIN code must be entered to watch it.
From the official Sony WH-1000XM4 Wireless Noise-Canceling Headphones manual, page 9
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