Unable to open Email Quarantine portal. It gives an "Invalid Domain" error when you try to login to the quarantine portal.
The domain is not provisioned to the region you try to login.
Please make sure which region your domain is provisioned on, US or EU.
If your domain is assigned to US, Email Quarantine portal should be https://us.quarantine.symantec.com/
If your domain is assigned to EU, Email Quarantine portal should be https://eu.quarantine.symantec.com/
For example, If your domain is assigned to theUS region while you try to login to https://eu.quarantine.symantec.com, you will get the " Invalid Domain " error.