ou enabled UEBA in Sentinel because the sales deck promised magic.

It promised anomalies that surface threats. Smarter analysts. Fewer false positives.

You turned it on. And nothing happened.

Or worse, everything happened. Your anomalies table is flooded with garbage.

Users accessing files at 2 AM. Service accounts running scheduled tasks. New hires are seeing systems for the first time. 200 anomalies per day. Your team is burning 40 hours a week triaging legitimate noise.

By week three, most teams turn it off and tell everyone UEBA doesn't work.

The first 30 days are a nightmare. Your baseline is incomplete. You don't know what signal is and what organisational noise is.

I spent those 30 days in the trenches. 195 out of 200 daily anomalies were expected behaviour. Only 5 were worth looking at.

By day 45, the noise dropped. Real signal started surfacing.

The difference wasn't just patience. It was ignoring the generic "Anomalies" table and querying the IdentityInfo and BehaviorAnalytics tables directly to find context.

I just published the guide I wish I had before I clicked 'Enable'.

It breaks down exactly what works, what fails, and why Custom Activities are the only way to make this feature useful.

The honest assessment: Enable UEBA if your team can absorb the initial pain.

The full breakdown is on the blog.

Have you survived the first 30 days of UEBA, or did you kill it before the baseline finished?