Is fast transition enable in SSID setting if Enable try testing by disabling this option If possible please share debug logs while connecting to 3702 Ap and 2802 Thanks
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Have you tried manually providing Controller IP to AP and seen? if possible could you send screenshot of AP join status on an AP from controller GUI Basically WLC 5520 box comes with 0 Licenses until we add licenses to it AP's doesn't join this might be also 1 issue
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