Clients in Flex-connect SSID (with Anchor Controller) not able to connect with BYOD

I have a WLC and having some SSIDs for Flex-connect mode (Mobility-group). Users trying to connect the wireless network using BYOD device but while they are trying to connect , it spins and spins . I checked controller , client is connected and got IP address and some users not but client says it spins and spins .No authentication prompt or no IP address
Can anyone help me how to proceed to fix this issue .
WLC : 2500
Software Version
7.4.110.0

Hi
I have tried this and things have changed slightly but it us still not syncing!!!! They are not talking!!!! my contact info is apparently not going to sync! ..... No good for my business !  Apple what are you doing.  Been loyal for 15 years!

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