Can you see quarantined messages via the Get-QuarantineMessage cmdlet? If not, check your Service Health Dashboard for any reported issues and open a support case to report this, as needed.
defender 365 - no data available
mara2021
1,081
Reputation points
Exchange Online Quarantine is showing "no data available". Data became unavailable yesterday afternoon (11/7/2023). Affecting all admins. Is there a Microsoft problem? What can I check on my end? Thanks.