check whether protocols are same in OAC profile you configured on client machine and in IC-4500 Authentication protocol Set. There should be same protocols in both and try to be in same order if there are more than 1.
In IC-----> Authentication->Signing In-->Authentication Protocol Set
there can be EAP-TTLS / EAP-PEAP (atleast one outer protocol)
also for inner there should be EAP-JUAC + EAP-MS-CHAP-V2 in both PEAP or TTLS.
There should be at least one outer protocol as in IC-4500 (EAP-TTLS / EAP-PEAP)
Then in TTLS Tab there should be EAP as inner protocol selected and add EAP-JUAC + EAP-MS-CHAP-V2 same can be in PEAP Tab.
***EAP-JUAC is must for Odyssey Access Client (with agent configuration)