Unable to find a suitable host

Hello,

When we try to provision (Infrastructure - Virtual Machines - Lifecycle - Provision VMs) a VM from CloudForms,
and in the process we are using the "Automatically select" resources option we are getting the following error:

[MiqException::MiqProvisionError]: Unable to find a suitable host

But when we don't use the "Automatically select" resources option, if we select manually the hosts and datastores, the provisioning is working.

The tagging is OK I think, when I log on with my user I can see the Provider (VMware vCenter) and the hosts (VMware ESXi 5.5) and the storage.

Any ideas?
If you need more information, please ask!

Thank you.