Hello @Tilman Schmidt ,
You can drop the investigation because this is an Expected behavior. The real-time data displayed in the portal is dynamically calculated, meaning the numbers in the weekly digest may not exactly match what you see in the portal at a later time. The real-time detection process analyzes signals directly from the request pipeline, while the weekly digest numbers are derived from raw signals rather than aggregated data.
Additionally, if any sign-ins were incorrectly flagged as risky (false positives), Microsoft's machine learning algorithms may have automatically remediated or dismissed them. As a result, these sign-ins would no longer appear in the portal.
That's why you'll observe such differences when compares with weekly email and Azure Portal data.
I hope this information is helpful. Please feel free to reach out if you have any further questions.