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For continuous Microsoft Purview Audit Logs and Microsoft 365 Audit Logs ingestion, the Unified Audit Log is better understood as an authoritative investigation surface than a pipeline source. While Search-UnifiedAuditLog and the Microsoft Graph Audit Search API are pull-based, throttled, and paginated for on-demand searches, sustained collection is better served by the Office 365 Management Activity API. This subscription-based feed is designed for durable ingestion workflows, making it the preferred approach for organizations building scalable compliance and security monitoring solutions with Azure Event Hub and Azure Functions.
An Microsoft Entra ID app registration (with ActivityFeed.Read, plus ActivityFeed.ReadDlp for DLP content) authenticates a timer-triggered Azure Function App. The Azure Function polls the /content endpoint on a scheduled interval, retrieves blob URIs, deserializes events, and writes them in batches to Azure Event Hub. This architecture separates data ingestion from downstream processing, allowing services such as Microsoft Sentinel, Azure Data Explorer, or custom storage platforms to consume the data independently.
Polling, rather than webhooks, remains the recommended design for Microsoft Purview Audit Log ingestion. Microsoft has de-emphasized webhook delivery because firewall-blocked notifications trigger exponential back-off, which can eventually disable the webhook. A polling-based Azure Function App removes the need for inbound endpoints, simplifies operations, and provides a more reliable foundation for continuous audit log streaming.
Subscriptions can take up to 12 hours before producing the first content blob. These blobs are not internally ordered, meaning a later blob can contain earlier events. As a result, deduplication is the consumer’s responsibility, using each event’s unique Id as the primary key.
The /content query window is limited to 24 hours and cannot retrieve content older than seven days. Once that retention period expires, unretrieved data cannot be recovered. To prevent duplicates or gaps after an Azure Function App restart, cursor state should always be stored in durable storage such as Azure Table Storage or Blob Storage rather than in application memory.
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