An integrated threat protection solution designed to detect, investigate, and respond to cyber threats across Microsoft 365 services.
Hello Scott, can you please tell me more information about the issue?
Maybe Alert is tied to an incident or still in sync. otherwise, you don't have the sufficient permissions.
I really advise you to contact (Microsoft Defender portal support) -- this is your best option
https://security.microsoft.com/
or Open Microsoft Support ticket
Include:
- Alert IDs
- Tenant ID
- Time range
- Screenshot of the alert that won’t close
- Details.
Best,
M.