Failed Restoration of Managed Backup from admin.

Can not restore Managed Backup from admin. It shows Failed Restoration notice as soon as try to restore the backup.
Tried to deactivate the plugin and activate it again and now it is not allowing me to activate the Managed Bakup.
It just says:
We couldn't verify your Snapshot key. Try entering it again, or reset it for this website in The Hub over at WPMU DEV.
Did it a few times, but it shows the same error?