@hs08When WLC goes down, FlexConnect AP loses access to FT key cache thats normally maintained on controller — and 802.11r only works properly when centralized key exchange is available... iPhones, whenever the SSID advertises FT will insist on trying fast transition auth path, and if that fails, they just give up instead of falling back 🙂
Android and Windows clients are more forgiving — if FT fails, they quietly fall back to a normal WPA2-PSK 4-way handshake and connect just fine, once WLC comes back online and AP re-syncs with it, FT key cache is available again, so iPhones connect without issues
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