I was playing around with my wireless networks at home and ‘forgot’ my main SSID on my iPhone.
I knew that iCloud Keychain would add and synchronise new wireless networks and PSKs across devices, but I didn’t realise it would also remove them across devices! Suddenly my MacBook Air dropped off the network and I had to re-associate and enter the PSK again!
Good to know when troubleshooting wireless issues with Apple users.
Wi-Fi Coops 