Failed Emails when Reporting Junk, Phishing, and Spam Emails to Microsoft

Question

Hello,

When users in our domain report junk, non-junk, phishing, or spam emails in their Outlook mailboxes, these reports are showing as failed in both the Exchange Admin Center logs and Microsoft Defender logs.

We do not have any custom email policies in place; we only use the default spam policies provided by Microsoft. It seems that Microsoft's spam policy is blocking the reporting of phishing and junk emails.

I have sent several emails to Microsoft for analysis but have not received any response.

Additionally, the failed emails are being forwarded to a user account designated as a migration account, which does not have email set up. I am unsure why this is happening.

Do you have any suggestions?

Thank you!

Failed Phishing Emails.pdf