I just set up a mobility express network in my home consisting of three 1815w APs.
Network works great, all laptops, macs, TVs, xbox, etc are seeing 400mb/s as expected...
The newer (X & Xr) iPhones in the home refuse to connect. They are running iOS 12, and say "unable to join network" or "wrong password" when trying to join. Sometimes they will join for a few seconds and then kick off. iPhone 7 has no problems connecting whatsoever.
Using WPA2 security.
I read somewhere about fast SSID switching being an issue, however I can't see that option in the ME GUI.
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