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O365 LastPasswordChangeTimestamp  property not updated after user changed his password

Éric Moreau
Éric Moreau asked
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In my Office 365 tenant, one of the user changed his password January 5th (I have the proof through an Activity alert I have set sent by Office 365) but the LastPasswordChangeTimestamp  property that I query using PowerShell is still showing the previous date when he changed his password (Sept 24, 2019).

We are using Office 365 alone (our AD is on-premise and fully disconnected).

We have a policy set to have the password expiring after 90 days. The user still have access to his mailbox.

Anybody saw that before? How to fix?
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Commented:
When you say you query it using PowerShell, you mean you're connecting to the msonline module first then running something like

Get-MsolUser -UserPrincipalName joeblow@yourdomain.com | Select-Object LastPasswordChangeTimestamp

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Right?
Éric MoreauSenior .Net Consultant
Top Expert 2016

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Commented:
absolutely. I see all properties except that the value is set to Sept 24 instead of being Jan. 5.
Senior .Net Consultant
Top Expert 2016
Commented:
Kind of found it. Microsoft looked at the logs and found out that an error was triggered at the exact same time that the LastPasswordChangeTimestamp  was to be updated.

I have since then reset the password and it now shows correctly.