我刚用 iMessage 问了下英文客服，说是没有共享位置的情况下，其他家庭成员是不能播放声音 /标记丢失 /抹除设备的，即使共享了位置，其他家庭成员只是能播放声音和标记丢失，但抹除设备依然需要待抹除设备的 Apple ID 密码https://support.apple.com/en-us/HT201087
If you turned on Find My for your device and you share your location with your Family Sharing group, your family can help you locate your device if it goes missing. Family members can:
See the location and online or offline status of your device.
Play a sound on your missing device to help you find it.
Put your device in Lost Mode if it was already set up with a passcode.
Remotely erase a device.