Event recognizing

See person on playback but no event triggered

Must be a vampire.

Seriously, person recognition isn’t a mature tech. Expect misses.

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There is so little information in your posting that there are many, many possibilities.

Do you have the current firmware? Is person detection enabled? Is motion detection enabled, with a valid detection zone? Was the person 2-20 feet from the camera? Etc, etc. Read this document for more info about person detection: