Intermittent authentication failures occurred between June 7th, 2022, at 1:06 pm (CDT) and 1:38 pm (CDT).
A specific user action in a specific sequence caused the directory service to crash. The directory service recovered itself immediately. During the few seconds it took for the directory service to come back online, authentications failed.
The site reliability engineering team instantly identified the root cause and prevented the sequence from being executed. The software engineering team implemented a permanent fix to the directory service to address the specific use case.