If you come across a guest who is signing up with multiple fraudulent accounts and these accounts seem to all be sharing a device here is how they may be doing this.
- While the Guests per Device setting is important this will only stop multiple signups when the sign ups occur via the app.
- When a guest account shows to be shared with many accounts this is a guest creating the accounts via the iFrame or many different devices, and then logging into the multiple new accounts via the phone app. This can also be checked by looking at the signup method on the guest account Timeline, this will show as via WebEmail when using iFrame.
- There is no way to limit number of sign ins to an app from already existing accounts.
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