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Promiscuous mode doesn't work on Wi-Fi interfaces.
The mode you need to capture traffic that's neither to nor from your PC is monitor mode. See the Wireshark Wiki's CaptureSetup/WLAN page for information on this.
Note that, unless your network is an "open" network with no password (which would mean that other people could see your network traffic, so you probably don't want that), you will need to arrange that Wireshark have enough information to decrypt the traffic to and from hosts on a network. See the Wireshark Wiki's HowToDecrypt802.11 page for information on that.
