As mentioned check the DNS, can you resolve from node a to node b with the command nslookup nodea.domain.com ? And also from node a to the node b? Finally, I'd highly recommend collecting a packet capture. Use the following documentation, it includes...

Hello Leonardo, if you are going to authenticate Laptops that don't have absolutely anything of configuration and don't have credentials to present/supplicant configured, I would recommend you to configure on ISE a policy set that catches all the aut...