Investigating accounts in Quarantine state

When the Sandbox Studio solution detects an issue with one of its sandbox accounts, the account is moved to a Quarantine state and an email is sent to the solution administrators indicating that action be taken to resolve the account’s quarantine status.

More information can be found in the support site on how to resolve this:

https://support.sandboxstudiosoftware.com/en/member/article/edit/16