Enable Charging Case sound of AirPods Pro Gen 2

Re: "charging case sound" : "turn off the sound my AirPods Pro makes"

This is how it should work ....

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Wear your AirPods, and make sure they’re connected to your device.:

Do one of the following:

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iPhone or iPad: Go to Settings,

 tap the name of your AirPods near the top of the screen,

then turn Enable Charging Case Sounds on or off.

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Mac: Choose Apple menu > System Settings,

click the name of your AirPods in the sidebar,

then turn “Enable charging case sounds” on or off"

from: Change settings for AirPods Pro 1 and 2 - Apple Support

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Above article also says: "You can also change the volume of the sound effects played by your AirPods.

See Adjust the volume of sound effects for AirPods."

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If no success after following the above details:

You may want to try updating your device to the newest compatible iOS version:

Check for updates in Settings or System Settings > General > Software updates.

(Note: It is wise to back up your data (iPhone or iPad before updating iOS.

or

Else: If your device is already up-to-date, you could try restarting it, as that often restores order.

You can check for AirPods Firmware updates too: About firmware updates for AirPods - Apple Support