Ansible playbook not looping through device_list - ansible

Question

I am trying to loop variables into a playbook, but I keep getting the following error
TASK [Add policy package to model device] ********************************************************************************************************************************************************************
failed: [fmg01] (item={'device_name': 'FGT1', 'device_ip': '192.168.0.103', 'group_name': 'Branch_Office', 'policy_package': 'default', 'device_serial': 'FGVM01TM12345678'}) => {"ansible_loop_var": "item", "changed": false, "item": {"device_ip": "192.168.0.103", "device_name": "FGT1", "device_serial": "FGVM01TM12345678", "group_name": "Branch_Office", "policy_package": "default"}, "meta": {"status": {"code": -10, "message": "The data is invalid for selected url"}, "url": "/pm/pkg/adom/root"}, "unreachable": false}
Below is my YML playbook. It works just fine when I use static variables (write out a single IP address and serial number as a string)
---
- name: Add model device to FMG and install Policy Package
hosts: fmg01
# gather_facts: no
connection: httpapi
collections:
- fortinet.fortimanager
vars_files:
- inventory.yml
tasks:
- name: Add model device
fmgr_dvm_cmd_add_device:
loose_validation: true
method: exec
params:
- data:
adom: root
device:
# device action: add_model
mgmt_mode: 'fmg'
#os_ver: 6
#mr: 4
sn: '{{item.device_serial}}'
adm_pass: 'password'
adm_usr: 'admin'
ip: '{{item.device_ip}}'
loop: '{{device_list}}'
- name: Add policy package to model device
fmgr_pm_pkg_adom_obj:
loose_validation: true
method: set
url_params:
adom: root
params:
- data:
name: default
scope member:
- name: '{{item.device_serial}}'
vdom: root
type: pkg
loop: '{{device_list}}'
- name: Install policy package to model device
fmgr_securityconsole_install_package:
loose_validation: true
method: exec
params:
- data:
adom: root
pkg: default
scope:
- name: '{{item.device_serial}}'
vdom: root
loop: '{{device_list}}'
Here is my inventory.yml file. I tested this ok with the first task. It passed in the IP address in ok. I tested the other tasks with the device_serial parameter, but that did not work.
#feeds into playbook
#add_device / add_device_group
device_list:
- device_name: FGT1
device_ip: '192.168.0.103'
group_name: Branch_Office
policy_package: default
device_serial: 'FGVM01TM12345678'

Answer 1

Problem turned out to be an indention problem with the params portion
- name: Add policy package to model device
fmgr_pm_pkg_adom_obj:
loose_validation: true
method: set
url_params:
adom: root
params:
- data:
name: default
scope member:
- name: '{{item.device_serial}}'
vdom: root
type: pkg
loop: '{{device_list}}'