[ovirt-users] Migrating VMs with templates from 4.2.8 to new 4.4.6 instance

Hello, I am having hard time migrating vms based on templates from existing 4.2.8 instance to newly installed 4.4.6 HCI with different storage. When I export VMs and corresponding templates to export NFS storage, detach it from source DC and attach the export storage to a new oVirt environment, the import of templates is failing with error "Failed to import Template XXX to Data Center YYY, Cluster ZZZ". I cannot find anything more specific about the error in logs. Am I missing something? Exporting to OVA and importing back does work, but I want to make use of template thin provisioning.