Asset IDs refers to the specific properties that were applied to the SharePoint and OneDrive items related to this event. ...

Asset IDs refers to the specific properties that were applied to the SharePoint and OneDrive items related to this event. For example, if you need to detect a specific employee's records, the ID might be a combination of the property "EmployeeID" and the value "SelenaLang12345". So you'd enter the two separated by a colon like this: "EmployeeID:SelenaLang12345".

SharePoint and OneDrive properties (also called "columns") help group, categorize, and track information in a list or library. Learn more about these properties​