Managed Backups not creating any Backup

When trying to create a Managed Backup the plugin start working, then when everything seems to be ready there is no backup available in the hub. I have 0gb used and the same problem in any site I've tried.
Sanapshot is working with dropbox, so is not a server issue.
I did grant access to one of the sites so that you can check it
Please consider that this may be a problem with my hub/account as I did have many problems in the past: