Hi @R Kendrick ,
Thank you for reaching out to Microsoft Q&A.
I understand that you are unable to dismiss the risk for a user who was deleted over five years ago. This scenario is addressed in the Microsoft documentation: Remediate risks and unblock users in Microsoft Entra ID Protection - Microsoft Entra ID Protection | Microsoft Learn.
Hope this helps. Do let us know if you any further queries.
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Goutam Pratti