I might be late to the party.
I suspect that this could be caused due to the bug in ISE 2.3/2.4 described in the below link :
A workaround has been defined in the link which is to remove "FALS" under "Enable Multi Shared Secret:String(128)".
Hope that helps
I never EVER post anything on the Cisco forums, however this time I'm going to.
Why is isn't this the answer that's marked as the solution?!?!?!
Thank you sir!
I had the same issue. I found a bug that has the fix action. I have pasted the results of it below for those that don't have a CCO account. Removing FALSE from the field listed below fixed the problem for me.