Ansible returns "Missing sudo password" error despite command is allowed

Issue

• Ansible returns "Missing sudo password" error despite command is allowed to be run without supplying a password.

• An ansible task is specified to run as become_user user:

  - name: Playbook
    become: true
    tasks:
      - name: Show running user
        shell: /usr/bin/whoami
        become_user: bob
  

• The REMOTE_USER (as specified in --user) is granted privilege to run the command:

  [jane@server1] $ sudo -l
  
  User jane may run the following commands on server1:
    (bob) NOPASSWD: /usr/bin/whoami
  

• The user is able to run the command directly without supplying a password:

  [jane@server1]$ sudo -u bob /usr/bin/whoami
  bob
  

• However, when running the ansible playbook, Missing sudo password error is returned:

  $ ansible-playbook -u jane -i inventory play.yml 
  
  TASK [Show running user] *******************************************************
  fatal: [server1.example.com]: FAILED! => {"msg": "Missing sudo password"}