Ansible Escaping in Shell Module

I was trying to configure an application to connect to ldap and noticed it was failing authentication, so I thought I would check the two commands that get executed to set this up to see what the shell command that ansible executes looks like.
So I disabled the mqsichangeproperties and mqsisetdbparms commands on the server and created the below little test playbook to see what the command string looks like… I run the playbook expecting an error of mqsisetdbparms: command not found
but this would allow me to see cmd and _raw_params keys when running with verbose output.

I noticed that the command for the first task is in the form that I expect:

"cmd": "mqsichangeproperties QM -b webadmin -o server -n ldapAuthenticationUri –v \"ldap://abc.company.com:389/OU=Users,OU=City,OU=Country,DC=company,DC=com\""

However, the command for the second task contains additional blackslashes, resulting in the incorrect username and password being set for the application…

Incorrect command form:

"cmd": "mqsisetdbparms QM -n ldap::company.com -u \"DOMAIN\\username\" -p \"pwd@pwd\""

Expected command form:

"cmd": "mqsisetdbparms QM -n ldap::company.com -u "DOMAIN\username" -p "pwd@pwd""

I feel as if have tried all possible options such as

• using double quotes for the variables

• escaping in the variables

• combination of single and double quotes with the variables and the shell command string

• Escaping the backslash in the ldap_usr variable

The test playbook I am using is below…

---
# file: test.yml
# desc: Test playbook
#
- hosts: target
  gather_facts: no
  vars:
    ldap_server: "ldap://abc.company.com"
    ldap_port: 389
    ldap_baseDN: "OU=Users,OU=City,OU=Country,DC=company,DC=com"
    ldap_usr: 'DOMAIN\username'
    ldap_pwd: 'pwd@pwd'
    ldap_auth_uri: "\"{{ldap_server}}:{{ldap_port}}/{{ldap_baseDN}}\""
  tasks:
#    - name: test setting URI
#      shell: "mqsichangeproperties QM -b webadmin -o server -n ldapAuthenticationUri -v {{ldap_auth_uri}}"
    - name: test setting user
      shell: "mqsisetdbparms QM -n ldap::company.com -u \"{{ldap_usr}}\" -p \"{{ldap_pwd}}\""

Using Ansible Version 2.2.0.0