---
- set_fact:
    tags_list: "{{ tags_list | default([]) |
    union([[tag.key,tag.value]|join(':')]) }}"
  loop: "{{ lookup('dict', vnet.tags | default({}, true)) }}"
  loop_control:
    loop_var: "tag"

- name: Get virtual network
  azure_rm_virtualnetwork_facts:
    ad_user: "{{ azure_ad_user | default(omit) }}"
    password: "{{ azure_password | default(omit) }}"
    subscription_id: "{{ azure_subscription_id | default(omit) }}"
    client_id: "{{ azure_client_id | default(omit) }}"
    secret: "{{ azure_secret | default(omit) }}"
    tenant: "{{ azure_tenant | default(omit) }}"
    resource_group: "{{ vnet.resource_group | default(omit) }}"
    tags: "{{ tags_list | default(omit) }}"
    name: "{{ vnet.name | default(omit) }}"
  register: azure_vnet_facts

- name: Create virtual network
  azure_rm_virtualnetwork:
    ad_user: "{{ azure_ad_user | default(omit) }}"
    password: "{{ azure_password | default(omit) }}"
    subscription_id: "{{ azure_subscription_id | default(omit) }}"
    client_id: "{{ azure_client_id | default(omit) }}"
    secret: "{{ azure_secret | default(omit) }}"
    tenant: "{{ azure_tenant | default(omit) }}"
    name: "{{ vnet.name }}"
    address_prefixes_cidr: "{{ vnet.address_prefixes_cidr }}"
    purge_address_prefixes: "{{ vnet.purge_address_prefixes | default(true, true) }}"
    location: "{{ vnet.location }}"
    resource_group: "{{ vnet.resource_group }}"
    state: "present"
    tags: "{{ vnet.tags | default(omit, true) }}"
    append_tags: false
    dns_servers: "{{ vnet.dns_servers | default(omit, true) }}"
  register: createvnet
...