What happened to this error: AADSTS50034 - UserAccountNotFound?

Kyle Main 6 Reputation points
2022-05-02T19:08:37.307+00:00

I work in a product that ingests Azure AD logs from many different customers. Up until around 4/21/2022 all of the customers were having logs with the AADSTS50034 - UserAccountNotFound error. On 4/21/2022 those logs suddenly stopped for every customer. We are still getting all of the other userloginfailed events, but that one error has specifically stopped suddenly. Did Microsoft change something in the logging so that the "UserAccountNotFound" error is no longer produced? According to this document it seems it should still be a valid error which is logged: https://learn.microsoft.com/en-us/azure/active-directory/develop/reference-aadsts-error-codes

I cannot find any references in the Azure AD updates or anywhere else. Since it happened for every customer at the same time, and nothing has changed with our parsing, I am thinking that Microsoft has done something with their logging so this error is no longer logged.

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Microsoft Entra ID
A Microsoft Entra identity service that provides identity management and access control capabilities. Replaces Azure Active Directory.
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