ExternalUserstate and lastsigndateTime/LastNonInteractiveSignInDateTime

[TherealKillerbe]

How can the externalUserState be accepted while both LastSignInDateTime and LastNonInteractiveSignInDateTime have no value?

ExternalUserState LastSignInDateTime LastNonInteractiveSignInDateTime
----------------- ------------------ --------------------------------
Accepted
Accepted
Accepted             22/03/2024 11:15:11
Accepted
Accepted             24/03/2024 21:52:44
Accepted

Doesn't the invitee sign in when accepting the invitation?

[#2 · Accepted solution]

Microsoft started populating those properties few years back (2021 if memory serves), so any user that has last authenticated before that will show a null value. That also applies to internal users.