AzureAD Member users sign-in as Guest

Chris Fitz-Gerald 101 Reputation points
2021-12-06T17:58:43.937+00:00

I have been going through the AAD sign-in logs, and I have noticed that several of my Member accounts have Guest login events. Most of the Guest logins are for SharePoint Online, but the User is using their Member credentials. Why would these sign-ins be detected as Guest sign-ins?

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Microsoft Entra ID
Microsoft Entra ID
A Microsoft Entra identity service that provides identity management and access control capabilities. Replaces Azure Active Directory.
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  1. Chris Fitz-Gerald 101 Reputation points
    2021-12-08T22:09:24.26+00:00

    I figured this out...

    These were my Member users signing into other company's SharePoints using our credentials! B2B Collaboration!

    The clues was in the Tenant IDs in the authentication info:

    156075-2021-12-08-16-06-20.jpg

    1 person found this answer helpful.

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  1. James Hamil 20,491 Reputation points Microsoft Employee
    2021-12-07T00:59:13.317+00:00

    Hi @Chris Fitz-Gerald , this is all for the same user, correct? I'll take a look at this and get back to you shortly.

    Best,
    James