You can use Audit Logs of Microsoft Entra ID to view the Gues User Invitation: https://learn.microsoft.com/en-us/entra/external-id/auditing-and-reporting. Thanks to this SO article; https://stackoverflow.com/questions/56765591/who-has-invited-a-guest-user, we have a detailed steps for viewing it. Please ensure you have necessary permissions to view Audit Logs of Microsoft Entra ID.
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Best Regards,
Braja-MSFT