Hmm, Im using 6.5.0.
Might be something quirky in the way the event is ingested, its only ADFS logs though, fairly std.
index=adfs "Event ID"=403 OR "Event ID"=516 NOT "Audit Success"
| rex "blah.internal\\\(?P[^ \n]+)"
| rex "Activity ID: (?P[^\n \"]+)"
| rex "((\\d{1,3}\.\\d{1,3}\.\\d{1,3}\.\\d{1,3}).+?(?P\\d{1,3}\.\\d{1,3}\.\\d{1,3}\.\\d{1,3}))"
| rex "nBad Password\s{1}\w{5}\:\s(?P[^ \n]+)"
| rex "nLast Bad Password Attempt: (?P[^\"]+)"
This is just one variation I have tried, of course I have tried the most basic one I listed first.
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