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Gonwild
Copper Contributor
Jun 03, 2022

Identifying stale guest users - 'lastSignInDateTime' not reliable?

So, I listed all of our tenant guest users 'lastSignInDateTime' attribute from MS Graph.

Most have up to date values here, but some got no info here (I guess its because they were never logged on), and some got the value '01.01.0001 00:00:00' ...which I guess also means they were never logged on?

 

But I have one confirmed active user with the '01.01.0001 00:00:00' value. Which makes me doubt if i can use these dates to delete inactive guest users? (This user is participating in team discussions, but his AAD sign-in log is also empty).

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