ansible - when statements should not include jinja2 templating delimiters

The "correct" syntax is to not include jinja templates as indicated by the warning. Your condition doesn't work otherwise because the types are not compatible.

You could try type coercion:

when: ' item.id|string not in sh_vlan_id'

See: http://jinja.pocoo.org/docs/dev/templates/#list-of-builtin-filters

Another example for reference ..

  - name: Sudoers | update sudoers file and validate
    lineinfile: "dest=/etc/sudoers
      insertafter=EOF
      line='{{ item.username }} ALL=(ALL) NOPASSWD: ALL'
      regexp='^{{ item.username }} .*'
      state=present"
    when: '{{ item.use_sudo }} == True'
    with_items: '{{users}}'

I was getting below orning.

[WARNING]: conditional statements should not include jinja2 templating delimiters such as {{ }} or {% %}. Found: "{{ item.use_sudo}}" == True

After making the below changes into the playbook it works fine.

- name: Sudoers | update sudoers file and validate
  lineinfile: "dest=/etc/sudoers
    insertafter=EOF
    line='{{ item.username }} ALL=(ALL) NOPASSWD: ALL'
    regexp='^{{ item.username }} .*'
    state=present"
  when:  'item.use_sudo|bool'
  with_items: '{{users}}'

UPD: if you use variable type boolean that == True not need