Customers who have migrated to Skellig and wish to access quarantine from version 8.00 are advised to add the IP addresses to their connectors as outlined in the documentation provided below:

https://support.titanhq.com/en/59614-locking-down-your-office-365-mail-server.html

The respective IPs and servers and its IPs are:

If you require a any help please open a support ticket.