MacOS keychain issue when connecting to CBS 240AC APs

[patrick.j.pecoraro]

When ever a Mac connects to our new air gapped network which utilizes the CBS 240AC APs we get the following:

Hitting cancel will still connect to the AP. We do not get any similar issue when using a windows 10 or 11 OS. I have not tried Linux yet.

[Haydn Andrews]

This is a MACOS issue.

There a few forums talking about this exact same issue:

https://apple.stackexchange.com/questions/199348/a-keychain-could-not-be-found-to-store-network

https://apple.stackexchange.com/questions/27077/the-error-keychain-login-cannot-be-found-to-store 

There seems to be two fixes:

Removing the network from the list of Preferred Networks:

System Preferences --> Network Preferences --> Advanced --> Find network and click "-" to remove from list of networks.

After that restart the computer, and was able to connect and save the network 

Other one is Keychain First Aid

• Run Keychain Access (found in /Applications/Utilities)
• click "Keychain Access" in the menu bar at the top and select "Keychain First Aid".
• Run the repair and then run verify.

Failing that if the mac has Apple care they are very helpful with OS related issues over the phone - i have used them before and even had them help my parents who wouldn't even know how to open system preferences

[patrick.j.pecoraro]

Neither of those fixed the issue. The threads you point to are some 10 years old.