By standard, there is no relationship between 11k/v and authentication. what they do is just change the flag information inside wireless beacon. If station doesn't support these functions, it just negotiates with AP through original process (during roaming).
Is the device keep connecting to the same AP when you executing the test? If so, there is even no roaming occurred.
It would be great if we can further check what symptom is when issue occurs:
You can collect the packets from AP's wireless and Ethernet interfaces, filter with "RADIUS" and compare them. Then we can check what's the reason cause to the issue.