Please note that ISE Live logs is the best way to check authentication issues.
ISE has local logging although it disabled by default for Passed Authentications. We may go to ISE Admin Web UI > Administration > System > Logging > Logging Categories. Select Passed Authentications and put a check mark on [ V ] Local Logging.
Then, we may either download the file(s) at ISE Admin WebUI > Operations > Troubleshoot > Download Logs > [ISE node name] > Debug logs.
Or, use ISE Admin CLI to tail on it.
myISE/admin# terminal length 0
myISE/admin# show logging application localStore/iseLocalStore.log tail