Use the Network Preferences of the Mac
The most basic method to forget a network on a Mac is through the Network Preferences of the Mac. Keep in mind that if the option did not work, then make sure the device is not part of a corporate network as the corporate policies may be stopping a user from forgetting a network. In that case, disabling the auto joining of the network may work. If that did not work, then moving the network at a lower position (you can drag/drop the networks) in the Preferred Network List may do the trick.
Use the Keychain Access Utility
If the above method did not work or the network re-synced through the iCloud from another device (like iPhone), then using the Keychain Access to remove the network from a Mac may solve the problem. The Keychain Access utility stores certificates, passwords, keys (encryption/decryption), secure notes, etc. The network credentials are stored in the Airport Network Password field.
Reset the Mac’s Network Preferences to the Defaults
If the issue persists, then you may reset the Mac’s Network Preferences to the defaults to solve the problem. Keep in mind you may have to re-configure or re-enter network settings of the Mac. If you are failing to forget a network that is in your control, then check if hiding or renaming the SSID of the network solves the problem. If that does not fulfill your requirements, then you may use a 3rd party utility (like Wi-Fi Explorer) or a UI script to remove the Mac’s Network.
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