Hello!
There is an event in CloudTrail that is named GetDashboard. Does this event appear only when you open a dashboard or it also appears when you refresh the web page with the dashboard?
Just to give an example, there is a user who performed GetDashboard - one at 10:03, another at 11:49. But if we look at the CUR to get the reader sessions, we can see that the same user was interacting with a dashboard also after 12 (last column is the number of reader sessions). For the reader sessions we have this “A Reader session starts with user-initiated action (for example, login, dashboard load, page refresh, drill-down, or filtering) and runs for the next 30 minutes. Keeping QuickSight open in a background browser window or tab does not result in active sessions until the Reader initiates action on the page”.