How about this?

tasks/persistent_cloud_new.yml

@@ -33,7 +33,7 @@
 - name: spin UP VM using nova_compute
   #delegate_to: 127.0.0.1
   local_action:
-      module: "nova_compute"
+      module: nova_compute
       insecure: True
       auth_url: "{{OS_AUTH_URL}}"
       login_username: "{{OS_USERNAME}}"
@@ -46,7 +46,7 @@
       security_groups: "{{security_group}}"
       key_name: "{{ keypair }}"
       nics:
-        - "{{ cloud_networks }}"
+        - net-id: {{ cloud_networks }}
       #floating_ips:
       #  - "{{public_ip}}"
   register: nova_result