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:
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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?
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:
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