Paul, most of the providers are already running the required update 1, but OP is not asking about this
@comunic, currently Veeam Agent for Windows is in beta and not all service providers allow sending backups created by a beta version of the software to their cloud repositories. It is forbidden by default by the Cloud Connect server, that's why you see this error message.
I would suggest to contact the MPS you've chosen and ask to enable this functionality for you. On the other hand, you can wait till VAW goes GA and then choose any provider you want to send backup to the offsite location.