I have an iPhone and iPad that have permission to connect to WiFi W (Work). I have a MiFi device (M), and I want my MacBook Pro to connect to M and not W. How can I do this? It seems that when Apple remembers a WiFi password (e.g., for W), it does it for all your Apple devices, including laptops.
Click the Apple on your MBP and select System Preferences... and then choose Network.
Click Advanced at the bottom and WiFi should be highlighted. In that is Preferred Networks. Select the work on and hit the - to remove it. Then connect to the MiFi and in that same area, click the +.
Should be all set then!
Short of asking them to simply blacklist your MAC address on the work network…
You'll have to remove one device or the other from iCloud Keychain. On the Mac or iPhone, go to System Preferences > iCloud and deselect Keychain. Then when you remove the Wi-Fi network on your Mac, it will not affect the iPhone.