Hello,
Can you show your cloud.cfg file ? And a sample of your blueprint ?
Did you installed the last version of cloud-init ?
Did you enabled cloud-init services ? Example : "systemctl enable cloud-init-local.service cloud-init.service cloud-config.service cloud-final.service"
Did you configured your network interface in DHCP mode ?
Did you run the command "cloud-init clean" after finishing your config ?
Did you configure you CD-ROM as passtrough mode ?
I believe these questions can help you to debug.