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Quarantine Expiration Date
I have my Policy setup to retain Quarantined items for 4 days, but I just noticed the other day the Quarantine is keeping them from much longer. I had some emails in Quarantine from early April that ...
could you refer link below to check your policy.
https://docs.microsoft.com/en-us/office365/securitycompliance/manage-quarantined-messages-and-files?redirectSourcePath=%252farticle%252f065cc2cf-2f3a-47fd-a434-2a20b8f51d0c
I'm not aware of any "minimum" day setting, so I guess you're seeing some bug/issue. Open a support ticket.