I tried to restore my sandbox instance (Online v9) to the latest backup. After an hour I got an error saying "An error occurred while preparing your instance". Currently, the Sandbox instance is not accessible to all users and the Existing backups are not visible.
I have raised a ticket in the admin.dynamics.com and also called Office 365 support to escalate my ticket. It's been more than 3 days and no one has contacted me at all.
Please advise what can to do next.