Unable to use ansible playbook to upgrade BIGIP - VE to 15.1.6.1 from 15.1.5.1

---
- name: Apply F5 base configs
  hosts: bigip-*
  connection: local
  gather_facts: no

  vars:
    netbox_token: "{{ lookup('env', 'NETBOX_TOKEN') }}"
    netbox_host: "{{ lookup('env', 'NETBOX_HOST') | default('https://URL.net/', True) }}"
    f5_provider:
      server: "{{ primary_ip4 }}"
      user: "{{ ansible_user }}"
      password: "{{ ansible_ssh_pass }}"
      validate_certs: False
    
    new_image: "BIGIP-15.1.6.1-0.0.10.iso"
    ## Where on the local system the ISO can be found
    new_image_dir: "image_f5"
    ## Where on the local system to place backups. 
    ## Subdirectories will be created based on the inventory hostname
    backup_loc: "/var/tmp"
    ## Prefix for the backups. For example a change reference, or just "backup".
    ## "pre-upgrade" and "post-upgrade" will be appended to the prefix.
    backup_pfx: "bigip_backup_config"
    
  tasks:

    - name: Get available volume number to use
      ansible.builtin.script: "{{ playbook_dir }}/cal_vol.sh"
      register: vol

    - debug:
        var: vol

    - name: Checking device reachablity
      wait_for: "host={{ inventory_hostname }} port=443 timeout=3"
      check_mode: no

    - name: Test auth
      run_once: true
      bigip_device_info:
        gather_subset:
          - system-info
        provider: "{{ f5_provider }}"
      delegate_to: localhost

    - name: Get Software Volume Information
      f5networks.f5_modules.bigip_device_info:
        gather_subset:
          - software-volumes
        provider: "{{ f5_provider }}"
      register: sv
    
    - name: Get Current Version
      set_fact:
        current_version: "{{ item.version }}"
        current_boot_loc: "{{ item.name }}"
      when: item.active == "yes"
      with_items: "{{ sv.software_volumes }}"
    
    - name: Identify Hosts That Require Upgrade
      set_fact:
        wants_upgrade: True
      when: not new_image.split("-")[1] == current_version
    
    - name: Identify Hosts That Don't Require Upgrade
      set_fact:
        wants_upgrade: False
      when: new_image.split("-")[1] == current_version
      
    - name: Only Upgrading Devices Which Need It
      block:

      - name: Check For Only One Boot Location
        set_fact:
          dest_boot_loc: "{{vol.stdout}}"
        when: (not dest_boot_loc is defined) and (sv.software_volumes|length == 1)

      - name: Check First Boot Location
        set_fact:
          dest_boot_loc: "{{ sv.software_volumes.0.name }}"
        when: (not dest_boot_loc is defined) and (sv.software_volumes.0.active != "yes")

      - name: Check Second Boot Location
        set_fact:
          dest_boot_loc: "{{ sv.software_volumes.1.name }}"
        when: (not dest_boot_loc is defined) and (sv.software_volumes.1.active != "yes")
      
      when: wants_upgrade

    - name: Device Version Status
      debug:
        msg:
          - "Current version: {{ current_version }}"
          - "Desired image: {{ new_image }}"
          - "Upgrade needed: {{ wants_upgrade }}"

    - name: Print Upgrade Information
      debug:
        msg:
          - "Current version: {{ current_version }} booting from {{ current_boot_loc }}"
          - "New Image '{{ new_image }}' will be uploaded from '{{ new_image_dir }}'"
          - "It will be installed to boot location {{ dest_boot_loc }}"
      when: wants_upgrade

    - name: Wait For Confirmation
      pause:
        prompt: "Press a key to continue..."

    - name: Save the running configuration of the BIG-IP
      f5networks.f5_modules.bigip_config:
        provider: "{{ f5_provider }}"
        save: yes
      when: wants_upgrade

  
    - name: Ensure backup directory exists
      file:
        path: "{{ backup_loc }}/{{ inventory_hostname_short }}"
        state: directory
 
    - name: Get Pre-Upgrade UCS Backup
      f5networks.f5_modules.bigip_ucs_fetch:
        create_on_missing: yes
        src: "{{ backup_pfx }}_pre-upgrade.ucs"
        dest: "{{ backup_loc }}/{{ inventory_hostname_short }}/{{ backup_pfx }}_pre-upgrade.ucs"
        provider: "{{ f5_provider }}"
      when: wants_upgrade

    - name: Upload image
      f5networks.f5_modules.bigip_software_image:
        provider: "{{ f5_provider }}"
        image: "{{ new_image_dir }}/{{ new_image }}"
      when: wants_upgrade
     

    - name: Activate Image (Will Cause Reboot)
      f5networks.f5_modules.bigip_software_install:
        provider: "{{ f5_provider }}"
        image: "{{ new_image }}"
        state: activated
        volume: "{{ vol.stdout }}"
      when: wants_upgrade


    - name: Wait for all devices to be healthy before proceeding
      f5networks.f5_modules.bigip_command:
        provider: "{{ f5_provider }}"
        match: "any"
        warn: no
        commands:
          - bash -c "cat /var/prompt/ps1"
        wait_for:
          - result[0] contains Active
          - result[0] contains Standby
        retries: 12
        interval: 10
      register: result
      any_errors_fatal: true
      when: wants_upgrade