Because the AlienApp for Office 365 data queries must rely on information as provided by the Office 365 Management Activity API, you may see non-sequential events as well as delayed timestamps for retrieved events and generated alarms. This is beyond AlienVault's control. You can observe the latency by comparing the TIME RECEIVED ISO8601 and TIME CREATED ISO8601 fields of an Office 365 event in USM Anywhere.
The Office 365 Management Activity API aggregates actions and events into tenant-specific content binary large objects (BLOBs). It creates these BLOBs by collecting and aggregating actions and events across multiple servers and data centers. As a result of this distributed process, the actions and events contained in the BLOBs do not necessarily appear in the order in which they occur. Also, the timestamp for logs stored in these BLOBs are based on the BLOB creation, not the events. For detailed information about log collection and aggregation by the Microsoft Activity API, refer to this Microsoft article.
Additionally, the Management Activity API incorporates mechanisms designed to ensure that customers have access to logs through service interruptions. This can result in a time delay of up to 30 minutes, and sometimes 24 hours or more, after an event occurs for the corresponding audit log entry to be collected and provided by the API. For a table listing the time delays of different services in Office 365, refer to this Microsoft article. However, if you observe delays to be more than 5 days, it could indicate a potential issue. Microsoft advises to check the Service Health Dashboard or open a ticket with Microsoft support.