I have seen this issue before but since it was quite sporadic we were not able to replicate it. I would certainly ask support about this. Did you check your audit logs to see if anything was tracked there?

I did not see anything there.  I have two users with this situation, but one is an internal employee.  I have submitted a ticket and I will update when I have a resolution.

Please do let us know how it works out. I wish I could recall what our resolution was.

We had the same issue, and we opened a ticket, which they claimed was resolved. If I remember correctly, they said the impacted user would have to log in again for the last update date to correct itself, which is massively unfortunate from a data integrity perspective. If the user still has a no last access date after logging in again, definitely open a support ticket.

After working with support, they informed me that there was a known issue in March and April that caused the “Last Access Date” to not report properly.  The issue has been corrected.  I have confirmed with a few of the users who fell into this issue that they are now reporting correctly.

The issue is closed at this time.  Thank you for your responses!