The Last Validated date is blank for a user or a credential:
Users and credentials are 2 separate entities in VIP Manager. The 'last validated' value is the timestamp of the last validation. A blank 'last validated' value indicates no validation events have been recorded.
Use VIP Manager 'end-user' reports to see when a credential is added or removed from a user, users are added or removed, etc The prefix of the request ID indicates how the operation was performed.
VIPMGR = VIP Manager
VIPSSP = SSP or My VIP portal
VIPLOGIN = VIP Login\Azure flow
9_9_2_0_w_10_255_1_141_3743547968 = VIP EG Version and IP. In this example, VIP EG. 9_9_2 indicates the VIP EG version, w indicated Windows (or L for Linux), 10_255_1_141 indicates the server's local IP, and location etc, 3743547968 = unique transaction identifier).
note: custom applications calling VIP Web Service APIs can create their own custom request ID.