Hi
My first guess here would be using the last successful sign-in field from the contact records
- you need to set the Site Settings Authentication/LoginTrackingEnabled to true
- for every sign-out there is a security stamp that is updated against the Contact record (adx_identity_securitystamp), as far as I remember it doesn't get updated on the login
- you can create a new field for "last successful logout" and then populate via workflow after the Security Stamp is updated
This way you would have both sign-in datetime and sign-out datetime.. now you can retrieve logged-in users
I haven't done this myself, but should work
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